Neopets.com is a great site with many virtual pets. you can choose up to 4 you want, feed them, buy them toys and other stuff! You can also earn np, it's kind of like money in which to buy food, toys, plushies, petpets, battledome items, etc. There are also games to earn np and different places to explore. don't forget to sign up with neopets and open a shop or create a guild!

Shopping Tips
Heres some shopping tips when wanting to get good items...
Always check the wizard first for the lowest prices
Visit the Magic Shop, Food Shop and Battledome Magic Shop.
When pricing items in your shop, price them atleast 100np less than on the wizard.
When in shops, look for rare things like neggs, scorchstones, faeries and things. These are good items and can sell for a lot!