Before you even consider actually taking any type of prohormone, you should be able to describe the exact chemical in the specific product, how it works, what hormones/processes it suppress/activates, its effect on bloodwork, mood, etc.
You need to have your supplements planned out, if you choose to do them. If I had to suggest a small decent stack, Super Charge Extreme NO from Labrada for pre and Dark Matter from MHP for post. You need to find your carb/fat/protein range and have either the first few weeks of it planned or have the budget to follow through with it.
You should have your diet VERY SPECIFICALLY tailored to the exact effect that you are looking for, ie, weight loss, muscle gain, the like. You should understand your body and metabolism type to adjust diet and exercise, FULLY understand your medical history with emphasis on heart and psychological problems.
And tailor your PCT depending on the hormone type too. Judging by the variety of pro hormones and their effects, its impossible to have a specific PCT plan. Be prepared to deal with estrogen, suppressed testosterone, cortisol, and changes in appetite.
And above all, consult with people who have experience every step of the way. Pre, during, and post.