At vanguard level 2 you can buy legendary boots and gauntlets for 75 marks each. Get vanguard marks from patrols and strikes you can earn 100 max per week. Vanguard bouties , patrols and strikes will give you rep towards your vanguard level. Continue to lvl 3 to get a commendation and the ability to get a chest piece. Do weekly heroic to earn strange coins, save up 13 for an exotic helmet. Level them all up... Boom! almost 32. Then you have to start crota for better armour.