It's funny, before you get the camera you think you need every accesory under the sun. All video guys need two things. A decent tripod and a descent mic set (perferably wireless). Especially important if you plan on charging for your work.
I have both and when I sold my old camera, none of my gear becomes obsolete. Basics first, then shop til your heart desires!!! (mine is lenses now )
a lens (50 f1.8 being the cheapest),something to focus with (http://www.lcdvf.com/) and a tripod or shoulder rig ( i'm using a cheap as f**k gorillapod rip-off as a basic shoulder mount. http://dealextreme.com/details.dx/sku.13610 )
haven't bothered with sound yet but will get a H2N4 (?) when i've gathered a few sheets