Never played a rogue myself, but from what I know at least reaching hit cap is always a DPS increase over any other stat(might be the same with expertise) so I'd say keep the hit and expertise and just do heroics/scenarios until you get better gear, from my own experience the MoP heroics feels very much like the wotlk ones where you just pull 2-3 packs at once and aoe them down(in short: They are easy) so it shouldn't be a problem you doing a little low dps at first if you have a somewhat decent group.
Also: http://www.noxxic.com/wow is a site which I used when I first dinged 90, it's really simple to use and it shows you everything you need to know.