Aco is a very bad class to start off as if you are new and dont have friends, priests arent really supposed to be killing things anyways
also you should kill thing 10-15 lvls higher than you,thats the things tht gives best xp use www.irowiki.org as a guide.
I suggest try getting a guild or making friends as you will need that to lvl as a priest
...except I started as an aco from scratch and got heaps of friends.
Topic:
Eden gears are enough for starter. You have an archer, you can try lvling and turning him into a Hunter. As hunter, it's better to go DEX/AGI because once you hit 99 you'll rebirth anyway, at which point you'll be considering VIT and INT for your future Ranger depending on builds.
Archer is one of the best farming classes in the game. You might want to focus on him first if you don't want to make a battle Priest or something. Supplies like bow and arrows might be hard at first, but I think selling loots should help you a bit on that.
Renewal has a level scaling system. Best exp gain is if the monster is at least 15 levels above you. Once you outlevel a monster the exp will decrease and you'll be forced to move. Database is your best friend:
http://db.irowiki.org/db/Honestly, VIP will make your life less harder.
As for meeting new friends/people. You can always go to towns and ask those peeps stuff. Some might be nice enough to help you out.