If your truly looking for spirituality and enlightenment these things can be had without entheogens.  These may facilitate and speed up the process, but are not necassary.  You truly must have a spiritual and meditative life if you want to gain these things threw DMT, etc.  Dont think you will take DMT and boom your enlightened, which I am sure you understand.

Try reading some begining meditation books and work up from there.  My first on was an invitation to practice zen.  I read it now and laugh at its simplicity, but yet helped to teach me alot in the beginning. 

Good luck,

oh and try growing mushrooms, not sure the laws on these in the aus though.