How do I level up???

By giving the games away

http://www.steamgifts.com/about/faq

Thanks guys, I've put my first give-away up now!! Much excite.

probably these two sites will help you as well^^
http://www.steamgifts.com/discussion/XaCbA/list-of-all-cv-levels-and-their-corresponding-real-cv
http://www.sgtools.info/sent/hawiancheeseball

so you need actualy one cent to reach lvl 1 (so after your first ga is ended, you will get it^^)
but remember: as in the faq is written, bundled games are counting only with 15 %. if your ga is bundled, you can check here:
http://www.steamgifts.com/bundle-games
(link is in the faq as well). so it dosnt matter, if you bought the game in a bundle or not but just if it got bundled somewhere or got a extremly high discount