Okay so I was thinking of making a character who rolls in a squad or posse.

If I go the necromage route and have a necromage type follower what can I have?

Imagine.

Me and two summoned atronachs, staff of sanguines rose for another daedra.
A follower who also summons//raises.
A dog
A horse
The ritual stone.
A follower who needs to come with me for a quest and cannot die (maybe also summons/raises in battles?).
The shout that brings a dragon to fight for you.

Anything else I can add to this?

That's a lot of followers.

Give your follower a staff of conjuration, other than that...

I think you nailed it.

Wait, staff summons and spell summons are seperate? I always thoguht they worked off the same counter.

uesp wiki says 9 total followers is possible
i dont think that includes odahviing the dragon

in their scenario that differs from yours they have summoned 2 dead thralls which are also summoners.
i didnt pay close attention, but i believe you can have up to 4? quest followers at one time (certain quests).