Everyone is a different shape and strength. One thing about your choice, is that it comes at a cheap price. You will not loose all that much when you decide, or if you would even need to, either upgrade or go up in weight. Your draw may change a little with a heavier bow or as your form develops, the worse thing is to be stuck on an idea of what your final weight and draw length will be in advance. Too much weight can wreck your your form or keep you from developing good form. Picking a draw length can be wrong if you are under drawing or over drawing with the lighter bow you have now. 45 is plenty, just make certain of your arrows, I have seen often that new comers get their arrows too stiff. Do not be afraid to ask for opinions on anything.