Shoot, learn and build up a portfolio. Start with friends and relatives who dont mind letting you practice. They can be your first source of 'advertisments'. Build up your contacts form there. I have started by shooting for non-profit organisations like the SPCA to build up my portfolio now slowy trying to go freelance...
#1. print business cards
#2. tell everyone about your photography business
#3. put your work online
#4. bring some hard copy of your work wherever you go, show to people whenever someone talk about photography to you.
For now, you need to go and find business,
when you are good, business will come and find you.