If you can afford a low priced bow(used/unwanted) with light poundage and light in weight would be a great starting point,then have some one, meaning knowlegable of archery(local pro shop/archery club) help with the correct draw length and the set up of the bow he will be starting with,keeping all cost down.This way you'll both be confortable with the time that will be needed to become proficient with this sport and as he improves and the enjoyment,knowledge,reach's the point of confidence and by then you will have the experience to upgrade your equipment, knowing your comfort zone in both draw weight and lenght,also the type's of bows available and assories you'll be wanting.I believe you should build yourself both mentally as well as physically before you build your equipment.I wish you both enjoyment and welcome to the sport of ARCHERY,hope this is of some help. Skip(physically challenged also) as a personal note,this sport has the finest sportsman of any,they are ALL willing to help in some way or other,and there is no question about being excepted,this I have expienced and witnessed.