What kind of paint should I get?

I just got this really cheap bookshelf and I want to repaint it. It has been repainted and has wallpaper on top of the shelves, but it doesn't match my other one. Would I have to take the paper off? Would I have to sand off the last coat of paint? Should I buy primer? This is my first project like this and I... show more I just got this really cheap bookshelf and I want to repaint it. It has been repainted and has wallpaper on top of the shelves, but it doesn't match my other one. Would I have to take the paper off? Would I have to sand off the last coat of paint? Should I buy primer? This is my first project like this and I have no idea what to do.
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