Selling Old Domain Names

Hello, I am brand new to online money making and one of the first ventures I am trying is the buying of very old domain names for cheap and trying to sell them for a small profit. I have read that a good way to sell domain names is to post them on forum sites along with the usual auction areas. As I have never done this before I was hoping to get some advice on how to best go about this.

i have 3 domains, do you need?