As YBX87 says you really should do some leveling... (And you got to do at least two missions... The first is really short, run to site, hit a button a few times, etc. The other one unlocks grenades or maybe a power/ability)
Its possible to hit lvl 7 in a fairly quick manner... Also DZ can be brutal with base gear. None of the gear you get can be used till you got back to a base of operations/Hub and why you can fast travel to a BOA/Hub you cannot fast travel back to the DZ. (Seems like a mistake to be honest.)
I was informed that the wife has plans for me tonight so I might not be able to get online till stupid late... There are rumors of a open beta in mid February... If true you might want to check out the single player tonight to give you a head start on it. (There is two leveling systems... One you lvl in the DZ (which is hidden) the other in the campaign/co-op area which is the level others see. I feel its the more important one.)
If you do want to do the DZ there is a matchmaking system... It seems like it is only located in the first hub. (Its off to the right. its between the gear and the weapons vendor.)
I didn't learn anything new from these but I wish I had known them day one.
Skills
Dark Zone Stuff
Mission Guide (This stuff has to be done to unlock DZ) (Possible Minor Spoiler Stuff)
Late last night the lvl 8 area still seemed to be hack free... (Granted, I'm sure some instances are better than others.)
The level 4-7 area I was in the previous day I suspect not... I've not seen an RPG in a players' hand in my entire time in the game except for that one DZ.
http://www.dsogaming.com/news/tom-clancys-the-division-beta-has-already-been-hacked/
As suggested in this article... Hopefully. the anti cheating is turned off as to not tip they're hand... If not the game has a serious issue.