There are many things to do. Work on your Eris missions(TDB questline) at the end she will have a mission that involves purchasing an "urn" from xur. after completing all her missions she gives you legendary gloves that can give you a max of 33 light. This will be enough to get you to lv 27 and do nightfalls/crota raids on normal. If you can find a group that can help you do vault of glass, that'll help you a bunch bcus you can get legendary raid gear from it that will help you also. good luck