Replying to Building a hip

there is a perfect spot to build a hip like 5 minutes from my house. the lip, from the ground is like 15 feet. atleast, and its a good 80 feet long. so it will be IDEAL to build a hip there. the question is, about the lip. should we put it flat, or like angle it a little to the landing? also what about the angle in the Y axis? like 60 degrees or soemthing? i dont mean like actual degrees, but would it be better to go steep cause its gunna be a HUGE lip or a shallow lip so we go far. ill get pics tomorrow after school. its all dark and shit now.