lol, dude I was lost my first few days on here too
I think you know how to upload things but just in case:
Go to the top right of your screen when you're on your own page and there will be a list of blue links that say things like "upload a deviation" or "update settings" or something like that. When you roll over that list the rest of the links will show up (because it kinda fades away when the mouse isn't on them) and in that list there will be pretty much everything you need.
And when you want to go to the main page of the site just click the DeviantArt at the top left of the whole page.
If you need to click to see your messages: look at where it says your name in a small dark grey strip across the page right under the "Search Art" thingy.
It looks something like this------Deviant~(your name) logout no subscription 2 messages--------Ok that was confussing, but bassically just play around with it and you'll get the hang of it.
Sorry for the confussing-ness of this message but If you have any Qs just leave me a message. :/