For one, welcome.

The intro section is not a sales section, but with being a new member you don't know the ropes yet. Which is very understandable, new members arent allowed into the sale section until a certain amount of time has passed or you reach a certain number of posts.

Once you reach that mark you can post whatever you have for sale in the sales section. You will need pictures and prices on each item per the rules. There is a small thread in that section that has the rules and such.