string length is generally 4 inches shorter than the bow length. It should say on the bow how long it is, I would suggest getting a flemish string because then if the 4 inch rule is to big or two small you can mess around with the brace height untill you get the perfect string length(you do this by either twisting the string in or out, not you can not twist a flemish string to much out or it will unravel, this mostly happeneds when people try and make it look like a double loop)
The bigger the brace height the less noise the bow will make and it could in turn go a bit slower, the shorter the brace height the quicker and noisier the bow will be!!! Hope this helps!
