yep scratching post of pad is a must.
once in a while since they don't go outside you can find them some grass outside and bring them some. i have three cats, mamma and her two kittens and they yell at me if i take mamma out for her walk (on a leash) and don't bring them in some grass from the yard.
then i must feed it to them blade by blade. really! they wont' eat it off the floor or a dish but they love it.