my advice would be, DONT try and "design" your own bow- for starters. i know so many folk that want to be "bow designers" and that usually leads to failure>
get a tried and tested design, get the stack height, follow kennys advice on building a form. and you will be fine.
ask lots of questions on here and you will be better than fine.
alternatively, get a pre made blank from kenny, do all the tips, overlays and riser shaping, that will give you a good taste for it.
problem with glass bows, is one gose to a lot of effort and expense to build a form, then to use it only once would be a crying shame .
Kenny also sells pre made forms.
or find someone close with forms etc, and go over and build a bow on their form, most bowyers are good like that.