I promised myself I wouldn't cycle until I can answer a full pages worth of threads, about the compounds I intend to take, at least. I think it's a good rule of thumb, but it's already too late for you to do that.
I'm really more worried about him not knowing enough about gear itself and what it's going to do to him than his training and diet being shit. If his training and diet is bad, best case scenario he'll gain about 10 pounds on cycle and lose it all when he comes off and waste some gear. Worst case with him not knowing about gear is gyno, trt for life, never having kids, high blood pressure, an infection from not knowing how to inject, injecting into a vain, just to name a few.