It's like Farmville, but with Pokemon. Did you even read the tutorial? At you house, you have furniture, and you can put stuff in your chest to take back to the "real" world. In the isle of dreams, you meet Pokemon. Do a minigame, you will be friends. At the tree thing at the end, you give the tree a berry, and you can take a Pokemon back with you to the entree forest in the entralink thing, but your dream will end immediately afterwards. As of now, you can only take 50 Pokemon back with you, although this limit was removed in Japan, so it may be removed here. If you want to see what Pokemon you can get where, go to Serebii.net and it will give you a list of items and Pokemon you can get.