There is a lot of information to be conveyed to members here, so it's difficult to get everything right! You tend to find that each individual section on the forum will have its own individual rules and FAQs that are highlighted as a 'sticky thread' - you can read those and it should give you a good idea of the rules you need to adhere to.
We're a pretty laid back bunch here though so don't be scared to ask questions if you need answers!
I found that FAQ, but isnt very helpfull. Try it yourself and search 'how to post an auction' or even just 'auction'. I think the usability of this site could be better.