I have a tablet! so I can help you ^^
first of, they take LOTS of time to get used to, trust me.
I've had mine for a year and I still find myself having a hard time getting used to it sometimes
so practice practice practice and lots of practice
what helped me was drawing on Tegaki and roleplaying with people on there too ^^
it's fun and it's a great way to improve lines+drawing
have you installed it properly? with the CD that came with it? ^^