You will need some sandpaper 220 grit , some paintable caulk,and your finger with a wet paper towel to smooth it out.
First fill any holes with some wood putty then sand any areas which protrude and are not smooth. Caulk all joints and let it dry. Tape off any areas you want to separate the colors, like the wood trim and the wall.
Then pick out your primer and paint and get to work. Read all directions before starting. This will make sure your materials are compatible with each other.
Paint choices? I go for what is on sale, it's inside so it won't matter too much.
I'm sure other folks have preferences.
Turn on the radio and have fun.