Be careful if you choose to use a business broker. I've dealt with many who were clueless.
We used
www.bizbuysell.com to sell our company (got a letter of intent the same day it was listed.)
Be careful not to under-value your business. Cash flow, annual revenues, and p&l are what most potential investors look at, regardless of the industry. If you have a decent client base and are hitting some numbers, you may be surprised at what you can get. There tons of resources on the web that help with biz evaluation info, and also several good books.
Try putting yourself in a potential buyer's shoes. What would you spend to buy your business? Are you willing to carry any of the
paper? If so, this may open up to more potential buyers, just make sure you have a great attorney to write up the contract.
Good luck! Selling your business can be a really exciting event.
Chris