The 6 players must be friends requirement is bullshit.. Bungie needs to add general chat, and make Raids matchmaking. I don't see them being successful without real matchmaking.
I'm level 24, inches away from 25 (like one legendary piece away from 25 and half) which I should get today.
If you can't find them legendary pieces, purchase them.
I maxed out the Vanguard marks for week one. The plan today is purchase a legendary chest piece after getting to lvl 2 vanguard rep (500 pts away)
Technically, you can reach level 23-24 with normal blue armor with light attributes.
-Play further into the story. I'm not sure if drops are connected. But, once I advanced further. I went from 20, to 24 in under a day. I also went from no legendary drops, to 4.
-Play patrol, light armor randomly drops
-Strikers, I get at least 2 light based armors every Strike.
-Weekly challenges- again, you should get no less than 1 light based armor.. Last weeks heroic challenge gave "strange coins".. You can use those coins to purchase legendaries..
-Continue to do bounties, play Crucible.. Keep gaining XP, which turns into motes of light.