It would be really helpful if you told us the steps you were using (maybe a pointer to the document you're reading) and an idea of where it all goes wrong.
Most of us have set up db's with no excitement/drama at all using the control panel. (Some of us multiple times because despite our luck in creating databases, we did it wrong).
Wholly - Use promo code WhollyMindless for full 97$ credit. Let me know if you want something else!