Easiest way is get to lvl 2 on vanguard for gauntlets and boots lvl 3 for helmet and chest piece. Run rocs for marks. Do some raid study so you know what to do and get in on VOG that gear will get you some lvl 30 gear. Then do the same once your at 30-31 with Crotas end . Just make sure you get on YouTube and do your homework on the raids they have been out for so long ppl aren't generally very receptive when you don't know what your doing at all. Don't worry about Eris it's only useful for murmur and xp to lvl up your gear.