You are so smart to plan ahead and not just go crazy when you get there. In the beginning I would suggest you take a pattern or two that you know you want to do. Then when you get there be sure you really like the fabrics you pick, don't just get some because the price is low. And lastly, I would tell you to try to keep a little of your budget aside in case you see a fabric you just can't leave in the store whether you have a plan for it right now or not.