youtube is pretty good for adding videos to your profile
you just paste the embedded code they provide into any section of your profile
about me
musicetc.
most sites you go to now provide the embed code
if you want to add pics and stuff you need the HTML code
you can load them into places like photobucket
http://photobucket.comor image shack for 2 examples
http://imageshack.us/this is a good site for a player to play tunes to add on your profile
http://www.playlist.com/and another
http://www.hypster.com/you can just do a google search on what you are looking for and it will tell you a lot
"You cannot dream yourself into a character;
you must hammer and forge yourself one."