Go into home Depot some things on how to repair hole in wall and other things as well
Youtube is a great resource if you want to see and learn how to do it.
Depends on the size of the hole. If its small, patch it with spackle. Use various grits is sand paper to smooth it out then paint. For larger holes, you'll have to replace sheetrock in that area. It's not hard but it is a bit time consuming. It requires cutting the hole a bit larger, tapping...if you're not interested in a bit of elbow grease and time, hire a contractor. Otherwise, jump in!
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