How can i earn money,I am a teenager but not 16 yet? -

I am saving up for a new guitar and really need to earn money and hopefully fast...have any ideas.... any will be APRECIATED!!! :):):) have a great day and thanks again!________My brother is 15 and he was mowing lawns for people to earn extra cash. Also he does things around the house and mom gives him allowance and he has taken care of peoples pets when they go out of town. There is also baby sitting?