It is 4chan though, so keep in mind that they are pretty unfriendly to "newfags" and some of them can be pretty raunchy and rambunctious at times.
A lot of the users on there can be perfectly level headed and proper bros though.
Just assume usual ACNL etiquette and lurk for a little while, you'll see how things go. It's common practice to use a pastebin link to advertise what you're looking for and what you have to trade.
www.pastebin.com
Users will look at your pastebin instead of your very long post instead.