How would I go about starting a business? also I need advice. Thanks.?

Ok, I am 14. I understand I am quite young but, I really would like to start a business. Something where I could put my creative, and imaginative personality to good use. I was thinking of making holiday related decorations. Maybe for Christmas I could make gift baskets, Christmas tree decorations. And other related items. I also thought about making jars with dry ingredients for certain kinds of cookies. I am only 14 and I don't have a lot of money to start off with but how should I go about starting out? How should I sell the items and sort of advertise them. I was thinking over Ebay or Craigslist. Maybe sell them at a flea market or something. What would be some good ideas? and what other kinds of items would you be interested in buying? Also since I am only 14 how could I prove that I am responsible and that all of this is going to good use and is legit...I was thinking about having a percentage of my earnings go towards a charity or towards a local food pantry. Also any other information that may help me? Thanks.