Then experiment with triggers. Try to put an idea into a map. Just starting immediatly on a mod without ever before having released some work is a bad idea. Get some experience in working out your idea's.
A lot of people have idea's. You need to learn to work them out and actually put them into a working map. Mapping isn't just technical knowledge only, or creativity. It's also just doing it. Trial and error. But if you're just doing it, the results can be very satisfying...