Your really new to this I see. First, welcome to the nut house. You have the desire and that is the first requirement. Secondly you need as much knowledge as you can glean from the works of others. TBB I is a great place to start in my opinion. Some of the data is dated but all in all, lots of wisdom. Ditto this forum. You have the luxury of interactive learning from some of the best bowyers around. Thirdly, you need the empirical part of the equation....the actual hands on practical doing it part. The reading and learning from others part is invaluable, but the hands on experience, learning by experimenting is where it's at. You've taken the plunge so let's see if we can teach you to swim as you struggle to tread water. Let's look at those measurements and see if your design is adequate for what you are trying to accomplish. Cangrats on the doing part. Your building a bow while others are just dreaming about it!