Tanks with live plants can be really easy, or they can be really difficult. I choose the easy route, and you should too in the beginning. Here's a really great article to get you started:
http://www.plantgeek.net/article_viewer.php?id=17
Start with the low light plants that are easy to find, and go from there. You vacuum your gravel about 2 inches away from the base of your plant unless you have a heavily planted tank. Some folks don't vacuum the gravel and just hold the hose a few inches above the gravel to pick up anything laying on top.