Oh wait you are... ANYWAY don't join a faction. By the time I reached lvl 20 on the 13 of September I was rank 2 crucible! I have realised that it is better to LEAVE IT! Because you can already by stuff from them AND they have more weapons. Many may disagree but it's just what I think :P
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You don't join a faction until you are level 3 with both crucible and vanguard. From there it'd be silly not to join a faction as you can gain rep double the speed with a faction than you can with crucible/vanguard as you earn rep for the faction from both PvE and PvP. This doubles the speed in which you earn rewards through the mail from leveling rep.