Leave cat-safe toys and treats, and keep the radio on when you are gone. Your inside cat will be in paradise. Leave toys or food out to occupy him. Keep your bedroom door closed. DO NOT play with your kitty if he wakes you in the middle of the night.
Scratching is natural to cats.
Kittens are curious and inquisitive and use their claws to explore the world around them. Have a scratching post available. A carpeted post or a sisal post, etc. Place some cat-safe toys or special treats and goodies nearby, or rub catnip on the post to lure your cat to the area. He will soon learn that this is his scratching station.