Well, recently I've seen about 5+ threads all concerning html. I did a quick search for html tutorials and I found a few sites for you all. Once you get the hang of html, it'll come to you naturally. Anyway I figured this thread would help out alot of you all, just check all of them and see which is the easiest for you.

HTML Help

HTML Help

HTML Help

Edit: Also, if you're planning on posting images for your sig, or anything for that matter a great place to host pics from is Photobucket

Here is a site:

HTML Goodies

They have Basic HTML all the way to Master HTML.