Person to Person
One on One trading is done with a double confirmation system. You offer your goods and either ask for or leave open what they will offer you in return. The other person has the right to refuse your offer outright, accept it, or alter the deal in any way. At this point the control goes back to the first person, who has the same options. It goes back and forth until both parties have accepted the trade as is.

Setting up Shop
To sell your goods to the public, you need to start up a store for your goods, or sell your goods to another store for resell. Generally it is customary to give store owners a discount on your goods, or you will drive up the prices. Also store owners might not be as accepting to your offered price as other folks would be, because they often get that discount.