The heading/thread should look like this:
NEED XXX for XXX
In the body, what you are reading now, should go the amount.
EXAMPLE:
Willing to trade 200 wheat for 200 iron.
I think 1:1 ratio is standard. Talk to the one who is posting and cut your own deal. When the deal is done, the one who posted the trade will send me a note stating the deal is done. I will then remove the post. Otherwise, in 2 days it will be removed and you can post it again.
Don't forget the more you want to trade, the higher your market must be.
(another reason to check the forum)
Thank you very much for your support!