Longer length equals more forgiving shooting, and smoother draw to given drawlength due to less stacking (all else equal). It is also easier to tiller due to more limb available to working duties. if you are knew, attempt longer bows. You will be more successfull in making shooter worthy bows, but if you just want to learn how to make a bow, try to make a 50" bendy handle static recurve of hunting weight at 28", or the like.