:gotsearch
obviously you're looking for someone to give you the answers, not help you...this forum is full of info on halodrol and h-drol...start searching.
I will make this short and sweet...kinda
halodrol is a steroid...I mild steroid, but still a steroid! it's good that you're looking for some answers before taking it, but I would recommend that you hold off for a while...do more research before you consider moving forward.
this product has a high level of liver toxicity and most people on this forum recommend that you start taking cycle support 2 weeks prior starting your cycle and run it through your PCT. if you haven't started that yet then you wont be ready for your cycle for at least a couple weeks.
how long have you been training, what are your stats (bf%, wieght, hieght, lifts, etc), and what are your goals?