First off, get a good mask. Spend the money on a great mask, can't stress that enough since it is THE safety precaution for paintball and you will want one that won't fog up. I would say a safe bet is 80 dollars (unless you already have one that is top of the line.)
Are you playing woodsball with the 800 dollars or speedball?\
The link above is to the reviews on this site to help see what is more down your style of play. Once you feel confident on the one you want, search the BST http://www.pbnation.com/forumdisplay.php?f=140
It is a broad question but when you get to different paintball markers, that can change what tank you get as far as Low pressure and High Pressure.
Hoppers: Dye Rotors are pretty well the norm. It is reliable and will last. Will keep up with the high end guns so if you do decide to upgrade someday.. one less new thing you have to get. $100~
Tank: 68/4500 is the typical tank size, but like I said with the paintball marker, it will depend on what marker you have to determine High or Low pressure tank. $100~
leaves roughly 500 dollars for a marker. Personally, since you are new, I would recommend either getting a used one here on the forums around 200 (do research first, the reviews on this site, youtube, something) Invert Mini, Ions, Older Dye Matrix's (DM5, DM6, etc.)
Like I said, it is a broad question but get the basics first Mask, Hopper, Marker/Tank, and a pod pack will be nice as well if you don't have one (30ish dollars)