Well the problem lies in the fact that reservations have no point if you go for a first come first serve basis.If your worried about people creating sheets before the thread is put up, then I don't think putting up a sheet was the best idea since it is conducive in causing others to cement their spots in a RP with characters immediately, hence why the sheet should be a final product most of the time. Unless you specified the sheet you provided was a preliminary in which case people are jumping the gun.