I have to say Lily listed them all lol I rely on word of mouth, referrals and networking. I also reply to RFP's when I see one that I would like to do. You wont want to reply to every RFP as you want to do the things you like and not just what pops up.
I believe a lot of us, when we are in the beginning stages, try to reply to every RFP, Elance and Guru post we see. What we forget is why we really got into this business for and that is the independence and working on the things we love to do.
My suggestion is start with the work you love to do. Find RFPs that fit into the things you like doing. If you end up working on something you know you do not like to do you will not do a good job.
Advertise with post card mailings. Talk to friends and family to let them help you get the word out about your business. That is the best way to obtain clients. The word of mouth actually starts with you
Good luck and let us know how you are advancing in your new business.
Sincerely,
Andrea