You visit other people's towns and pick their fruit. Fruit that are not from your town sell for 500 bells each. People from an online play or from DS to DS connection can buy from Nookway. It's required that people from another game to buy or sell one item to Nookway for it to expand into Nookington's. Also, if you visit other people's towns, you can talk to the animal residents there. If you befriend them, they will send you a letter and may move to your town. You could also look at your friend's house to give you ideas on how to decorate your house.