Make good use of the post preview. As that will help you determine which html does or does not work. That is exactly one of the reasons why it's there so that you don't waste time posting things that don't work.
As an example of some of the things you'll be able to achieve on the forums, please check the Econ. Report that I used to do. This is the latest incarnation. Econ. Report. Unfortunately, I have not had time in a long while to continue to do it.