It is simple guys.
If you have the worst luck and can't get a legendary armor drop then.
Get highest level blue armor ( starts with 13 light) and max them out, also grab strange coins from missions and weeklies.
Wait for Xur to show up, buy one piece of exotic armor for your class. Once you get a bit experience, you should be level 25 now.
From then on do strike playlists, crucible, bounties and Raid. First legendary will bump you to 26, second will bump you to 27, third will bump you to 28 and leveling them up will get you to 29.
After 29, you have to play the raid and get raid armor to get to 30.
Also don't forget, sometimes you'll get 2 legendary armor drops in the same mission and your one legendary one exotic hunter will become fully equipped within minutes.
Except for the fact my hunter has been stuck at 29 for a few weeks now. I've only gotten weapons and some raid gear. If I find a chest that means I'll need the boots to get 30. Otherwise I need boots badly so I can utilize my exotic piece