There is no fast fix. You will have to put in the work like everyone else has had to in order to get legendary gear, and the odd exotic. It really is simple. Do all bounties daily, do at least one public event a day to get the rewards and marks, do the daily heroic mission, do the weekly strike, run some strikes in the tiger playlist. Rinse. Repeat. I hate to say this though, but it took me and probably most people in the game, at minimum 100 hours before I was buying my legendary gear and closer to 200 before I hit level 30 and got some exotics. Patience and time... Like the snazzy sniper rifle says... And you'll get there. Also, pray that RNGesus loves you more than it does most players... Good luck!