I would suggest that 100# draw weight is WAY down the road for a beginning archer and is probably not in the cards at all. You will notice that there are very few hunters here who handle any thing close to that, even for the really dangerous stuff.
However, if you are determined to draw that much weight, plan on a long, long training regimen. Go slow. Personally, I don't think you need it. I have pulled that much weight a few times, but I simply don't have the physical makeup to handle it. Few of us do.