LOL. everyones first cycle should only ever be test only because if its not you will die OMG. What stupid advice, if he want to run deca then the advice you should give him is ALWAYS run testosterone in a steroid cycle and at a higher dosage than the steroid.
Also major fail on the OP's behalf for not knowing the side effects of deca until you fucking pinned it ?!? I knew about the sides of each steroid about 2 years before even trying them. Do some research before you buy and inject yourself damnit.