Bake all the time. Develop some favorite recipes and give them to your friends and family. Ask for their honest opinions as to what is best and what could use improvement.
Create a list of the products you would like to sell. Bake samples of them that are flawless in design. Take photos of these.
Create a website with all your products and the photos you took of them. Have business cards made. Pass these out to everyone you know.
Get involved with your local Chamber of Commerce. They host a lot of events and you can offer to have cookies at these to give your business exposure and allow people to sample your products.
Continue baking and selling. Tell everyone you know and meet about your business. Word of mouth business will be best for you but you also have to advertise. Put coupons in the local papers and try to just get people to walk into your shop because once they do they will be hooked. Good luck.