That shows up for me sometimes too. Try to just refresh the page. Engineer is good. Once you get to the higher levels you can start making some serious money. I would recommend spending your stat points on Agility and Melee at first. Just max Agility and work Meele up a good bit. Then start putting the stats into Strenght and machineguns or shotguns. You will need a certain ammount of strenght to use certain weapons.
Agility is important for getting to the far ends of the town where the best loot is. And also a ton of goddamn zombies which will take forever to kill!
Outpost attacks are a great way to lvl up quickly, I think they happen once every 4-5 hours. Also one of the worst things you can encounter early on is a zombie that is on fire. Yes, on fire. If you see it. Just run. Get inside a building, and outpost or go to another block. Unless you have some serious firepower and half a ton of ammo you wont be able to take it down.
Edit: Link to the clan I'm in and it's thread. No real clan system in this game, but they are still good to have for advice and other things.
http://fairview.deadfrontier.com/onlinezombiemmo/index.php?topic=832598.0