everything is actually very individual. HCG, AI, Test dosage = all individual. I know many guys who don't run HCG and they don't need to. Moreover, others tried HCG and they did not respond well. As for AI - there are those like
@bobby ricky using a gram of test per week without the need of an AI but I also know those who develop gyno at 200-300 mg/week of Test.
lastly, test dosage depends on a lot of things such as your health, response and goals. 500 mg/week may sound good, but 300 mg/week is safer. I also recommend having a bloodwork first.
tell us more about your goals, stats, and level of experience dieting and working out.