"Trulia" and " http://;www.realtor.com"
websites are reserved for real estate professionals only. If you do want to market your own property, websites such as Zillow, Craig's List, and FSBO, etc. are great options.
Keep in mind that you do have choices when dealing with a real estate agency. Commissions are always negotiable and there are several different listing agreements to choose from.
With so many pitfalls associated with selling/buying real estate, I would suggest speaking with a licensed real estate professional in order to have all of your questions answered before trying to sell on your own.