Well I'll have my Nord Dragon priest mage do magicka fully till level 16-20 like my High Elf and rely on the enchanted ring and arkay blessing till then. Will probably also get Galdur's amulet (+30 magicka) or Necromancer's Amulet right away also. Would get the Antronach Stone right away but 1. I feel I would need the Mage stone early on to make up for the lack in skill and 2. I may wanna rely on a summon storm antronach staff while doing the college. May use a lot of my early income buying spells and training destruction early instead of getting the breezehome right away. I like to get Destruction to 40-50 asap for Dual-Casting staggers when enemies get too close. Not to mention Fireball and Ice Storm become my bread and butter attacks for the entire game.
What would be a good level to enter Solstiem? Cause I want to try and make use of some of Neloth's services early on if possible.
My own sorceress will not be entering Solstiem until at least between 30 and 32. Closer to 32. I have put one sorceress through and she did pretty good and she was level 43 playing on apprentice. I was on adept but had to lower to apprentice. When I went in I had enchanted steel plated armor, a ring of health that did 40 health, circlet that did 70 magicka, and the boots were elemential, such as boots of fire protection, boots of shock protection, etc. I also had the archmage amulet, and Lydia. I had Dawnbreaker, plus 3 silver swords that I got from doing the dungeon for the companions, plus she was a werewolf. Those silver swords with the enchantments on them saved me alot of times in close quarters.
I read that if you are a mage, and you have augumented fire 2/2 and augumented shock 2/2 then you can create a fully synergised weapon, and that placing a fire and shock spell spell on a weapon will produce a chaos weapon with 100% increased damage in both elements. I started enchanting weapons to bring it up, along with dis-enchanting, and by level 30 I put the "extra effect" into enchanting, for enchanting was a major skill, and used the silver sword to enchant. They carry a permanent +20 damage to the undead and work just fine in close quarters, which is why I put a 5/6 perks into 1-handed. Another thing I do is get the black star and the soul trap spell for keeping my swords charged, plus soul gems work fine also. One sword with fire and one sword with frost, and 1 sword with both for chaos. I mostly use the fire silver sword.
After I get the last perk in enchanting, I make a few potions in fortify enchantment and enchant some heavy armor, usually plain steel plated, although with this new gal it will be light armor because of Miraak's robes which are light armor. I do not remember what armor rating, if any, the cultist's robes have, but if there is an armor rating, I will probably use those to enchant, except the masks. I will still do the silver sword enchantments and the rest are either given, found or purchased. I also gather everything that I can find to make potions so that I can raise that and she likes to make her own.
Breezehome has a well known "glitch" where you can get her for free which is what I do, and then I furnish it. Like you, I need the monies at the beginning of the game, but instead of training in destruction, I train in enchanting. Conjuration raises fast on its own, and by training in enchanting, instead of destruction, by the time I get to level 30, my destruction tree is up to both augmented flames 2 and shock 2 and frost 2, and I am at expert, or pretty darn close to it. After enchanting is done, then I will be ready to go to Solstheim. Because master spells in destruction take 2 hands, and take so long to cast, I use scrolls and do not bother in the "master level" spells in destruction.
Because you are going for "magic absorption" you are better off, as you said, using staffs for atronach's. I understand that you can make high-level staffs in Solstheim and how high depends on your enchanting skill level and the level of the enchantment you wish to use. Another words, if you have say 100 in enchanting, and you have master in destruction, with all the fire perks, then you can make a staff of fire that does a heck of alot more damage than if your enchanting skill was only say 45 and you had only sat adept in destruction. Hope that made sense. I am not going for magic absorption, but for magic regeneration, fortify magicka, and fortify health, and will have "homemade" potions of fortify destruction if I need them, along with the basic homemade potions.
Like I said earlier, if you are going the dragon priest route, find and keep some "dragon priest daggers" and I have even come across a couple of "dragon priest staffs" and the staffs do more damage than normal ones. Both would go great with your character. Use a mask to help with magicka, etc until you get where you want to be.
I will be doing
Join the College and get robes and hood
Some side quests till level 6
Bleak Falls Barrow (my training dungeon)
1st dragon for the Jarl, get house and Lydia
Few more side quests
Go to the Greybeards, kill 2 dragons on the way by the imperial camp, get both word walls
Join the Companions, do quests to get the silver swords and word wall and become werewolf, end of companion quests
Join the Thieves guild, do the 1st quest, get outfit, accept quest to burn bee hives, accept quest from Delvon and Vex, end of Thieves guild quests
Join the Dark Brotherhood for the outfit, mainly the boots and word wall, end of Dark Brotherhood quests
Go back to the College and start the college quests, and do them all
Get the Horn of J Windcaller and get the last word of the fus-ro-dah shout
Prove to what's-her-face that I am the dragonborn
Do more side quests or just find dungeons with magic items, like the Wolf Queen until level 30
Probably do Dawnguard also and 1 house for Heartfire
Major skills will be enchanting 1st, then destruction to expert, conjuration to master, and some restoration. Restoration only to adept.
Minor skills will be light armor with this gal, although I usually go heavy armor, alchemy, and 5/6 perks in 1-handed. Maybe a couple of perks in sneak.
Weapons will be enchanted silver swords, plus I will do The Dawnbreaker quest and the Black Star quest
Stone will be the mage stone throughout.
I did some teeking on her yesterday, and I believe I got her all ready for today. Will start her this afternoon and see how it goes in the "test dungeon." lol