1-craft an axe, then shop down trees. anywhere.
2-You start with a flamer. Then, you should be able to buy quickly an rpk. (sma ammo as AK). Armor : craft it. It's easy to craft quickly a metal armor. First, craft a pickaxe, then go in mines and dig some minerals. Combine them in metal parts/alloys, then you will b able to create your first metal armor.
3-Once you're geared, you should go do some assignments with others players. Play alone is quite impossible here.