Welcome to Christian Forums! I am really glad that you registered and hope that you will stick around for a while! As you have probably noticed the site is extremely large... It can be a bit overwhelming at first. Just take a deep breath and dive right in!
Here are a couple tips that you may find helpful: (Orange text are links you can click)
You can quickly find message threads that you have posted on by clicking on the "User CP" link up in the top left hand side of the menu bar.