Crafting can end up leveling your character beyond what your combat and defense skills are if you grind it.
This. Also, be very careful about maxing ability constellation numbers (100) because you will level your class past the mobs LVLs (I don't know if it's printed anywhere official, but most people agree and I've noticed it too, that the mobs cap at 50). To me I'm OK with that, but a lot of people who have gotten to 81 say they've 'broken' thier game because it's not "challenging" enough.

Don't put perks in Lockpicking, you will open the locks with or without perks, and if you have trouble, that's where enchanting or alchemy comes in.
Edit: I forgot Smithing LOL So yea, at least get it up to 60, so you can improve Arcane Gear. This will take only 2 Perk points, if you just go that route.
These. I didn't put any perks in Lockpicking on my 1st character. It's almost 90 now and I can always open Master locks with only 2-3 picks broken at worst. There's also a Stone you can activate that helps picking (it doesn't help LVL your skill, but it will automaticlly open lower level locks).
The thing about Smithing is if you want to get Legendary Ebony or Daedric weapons you might want to max it to 100 with those perks otherwise you have don super enchanted gear and drink max pots.
Also, everything else Agrona said.

First off, don't spend all your perks as soon as you get them.
This to be sure.

Also, along the lines of what Rosveen said: see how you play your character because you may find you play differently than a "standard" or "recommended build" type. I'm like that - many people in MMOs get mad at me because I don't use standard builds and standard play styles for most classes.

If you're the sort who can pick locks without needing the perks, then lockpicking is sort of a loss of perks that could have been spent elsewhere.
This again.
I do have a few questions left:
1 Would u max the first skill of 1 handed and/or archery to 5/5?
2 Is critical perk on archery worth the point?
3 What do u mean by, and how does grinding and leveling work as described by CCNA?
1. I will always Max the 1st Perk set of 1-H because I'm a melee-er by nature, but I would recommend at least one of those be maxed.
2. IDK
3. You can grind Smithing, for example, by just making Iron Daggers (I do this.

) so my Smithing will be at 100 before I hit like LVL 20. You can also do it with Alchemy by just acquiring ingredients (farming or buying) and just make a $***load of pots. You can do the same with Enchating (if you have enough Soul Gems (farming or buying) by Enchating every weapon you collect/craft.
Use the Guardian Stones. I actually run (Fast Travel) to them and activate whichever one I need. If I'm going to grind Enchanting I activate the Mage Stone and Fast Travel back to an Enchating Table. If I'm going to grind out Smithing I activate the Warrior Stone. If I'm grinding out Alchemy I activate the Thief Stone.
Also, even as a Thief/Assassin type you may want to have the Warrior Stone active at lower levels to level up your armor and 1-H skills. That being said, I believe Archery is probably Thief Stone sooo...you decide.

Agrona mentioned only going to Fire Enchanting - you'll need to go past that if you want to Double Enchant items.

I will always do this on any character for 2 reasons:
1) I want to be able to put 2 enchants on items. (Be advised that you must put both enchants on at the same sitting - you can't put one on and come back later to put a 2nd one on.

)
2) I like to have Frost and Shock enchants for when I fight Mages - mainly Shock because so far both of my characters have been Nords.
One more thing about Enchanting and I'll give you time for your head to explode: I've not found Soul Siphon to be very useful - maybe I'm using it wrong, but, as I read it, it should be a permanent effect. It just doesn't seem to recharge the weapons much or make them discharge noticeably slower.