Do you have the last patch? It adds more ammo and stimpacks.
Are you playing turn-based like FO1-2? It's a bit easier that way.
Level 1 wasn't too bad with me + medic & sniper gal, just a typical creep and shoot. I think I took out the guy and dog to the East before heading back West and North, then more or less a straight clockwise circle o' killin'.
By the way Jagged Alliance 2 is a better tactical game and a little easier at the start, even if the setting isn't quite as cool. And targeted shots aren't near-useless like they are in FOT.