Eh,i dont know now!I heard a rumor about it:By getting the map upgrade for 150 mp.
You cannot construct your own spells as you could in oblivion, you must find or purchase spell tomes and consume them.
Cast spells
There is no option to make custom spells like Morrowind or Oblivion. You have to stick with the ones taught to you by the spellbooks you buy.
Cast a lot of alteration spells.
You will always have a spell in use on Oblivion. If you don't want to use that spell, then simply select a different one. :)
The dark elf is very good for spells.
Join the mage guild, get all the recomendations, enter the university in the imperial city, use the spell making alter.
You have to become a high level character in order for them to appear, or you can make them yourself in the arcane university.
30 second invisibility
They are in all of the cities mages guild mostly or in the ARCANE UNIVERSITY.
It should be in the list of all your other spells. Cast it normally.
There's an area in the Arcane Univercity on the far right or you can go to the Arch Mages Quarters and there is a Altar Of Spellmaking near the bed.