Talk to Saria and then go to the training center. The training center is to the left of your house, the south end of the map. Go to the back of the training center and find the hole in the wall. Crawl through, dodge around the boulder, and find the chest to get your sword. Return through the hole. Walk around the village, talk to the Kokiri's, and slash bushes, throw rocks and pots, etc. to earn money. Find Mido's house and go inside to steal his money from the treasure chests inside there. Once you have 40 rupees, go to the shop with the red roof and buy a Deku shield. Equip the shield and sword in your subscreen and then exit the town on the East side of the map. You'll have to talk to Mido to get through.