I would suggest attending a few KittyCat auctions so that you can learn more about the wide variety of KittyCats traits and can get connected with our community.
KittyCats Auction Calendar
Premium may very well be worth keeping, but that's your choice, of course. While you can rent some land for your cats without a premium account, it generally ends up costing as much, if not more, to rent as you would pay to keep your premium account and your Linden Home, so I have always ended up going back to premium.
