Most cats will sleep for about 16 hours a day. Sometimes it can be hard to figure out if your cats are playing or fighting. Sometimes cats may hiss or make other sounds during play, but there is usually no loud wailing and howling. If one or both cats seem to avoid each other for a while after the 'event', it was most likely a fight. With play, cats aren't afraid of each other after it's over.
Scratching is one behaviour that causes many cat owners some grief.
Scratching serves several functions for the cat, like claw maintenance, stretching muscles and tendons, and marking territory. Without declawing the cat, it's very hard to stop a cat from scratching. The easiest thing to do is to encourage the cat to only scratch certain items. It's important to start this early because cats will develop favourite scratching places. Cats have personal preferences for the types of objects they'll scratch, so try to have a variety.