I got to lvl 30 by the end of tatooine and the bonus quests. I dont do pvp, have only ever done 2 flashpoints but have done some space missions. I have started on nar shaddar bonus missions but if alderaan is aimed from 28 upwards i may go there and put the nar shaddar bonus ones on hold for now. Shouldnt have a problem levelling on this game though, if anything i have found too many quests and they all end up going green before i get to them. Maybe thats just me though