A few typos- "wether" should be "whether", "cought" should be "caught" and you use "ressources" a few times when you mean "resources".

In general, I'm not sure that this is really going to work well. Relying completely on other people casting spells on you to get any magic severely limits what you can do. Note for example, that the Spellthief is very weak and it even has a small bit of magic itself. You may want to look at this (somewhat popular?) Blue Mage homebrew which does something similar but ends up not at all weak.