I am thinking about selling my condo and purchasing a house,?

But i need to first find a Real Estate Agent/Realtor. I dont want to list my home for sale with those big companys that charge you 6% commission since i might be taking a loss by selling, so the less i loose the better i am. Do you have any reccomendations on choosing a real esate agent and what is the diffrence between a realtor and a real estate agent? Any questions i should ask when choosing one? Any help is apprecieated.