hey!!
uhm, first of all you could look at tutorials for beginners. but my advice would be to try to get familiarized with the tablet and how it works. it's difficult at first because you lack practice and what you should do before you want to try to draw or colour anything is to see you can work with the tablet, get used to using it, sketching and whatnot.
at least that's what i did, because at first i couldn't draw perfect lines, i was too used to the pen/pencil. that would be my advice, but you can draw something until you get the hang of it and see what you're comfortable with