If I want to make an NPC (for exemple, Spriggan) or any other NPC Summonable with a spell (A spell that can summon them) how do I do it?

thx for helpers, and btw, I know how to make a spell book and about the magic effects, I just dont know how to do this in Conj spells.

Unfortunately I cannot answer your question personally, but I do suggest you take a look at this mod:

http://skyrim.nexusmods.com/mods/12476/

It seems that whatever method they use should point you in the right direction