*Focus on Food. Honey. Try looking for hives. Pick up every berry and mushroom you see. Kill every boar and deer you come across.

*Troll armor. Assuming you have a base of operations(which you should, for storage.), stock up on wood, resin, and feathers. Feathers are easily hunted by killing birds during stormy days. Resin, wood and feathers makes fire arrows which are very effective against trolls.

*Avoid caves until you have upgraded Troll Armor. That is my personal advice. Until you shore up your base and supplies, you won't really have a need for what's in caves. Number one focus at this point is stabilizing your food system.

*The Nine volt Reindeer gave you access to copper and tin(Black Forest). This is the first natural progression in the game(The Bronze Age). This upgrades everything so do not ignore this. At this point, Cave exploring will be needed.

After all this, it's all downhill, more or less. Do not be stupid or lazy, because YOU WILL PAY FOR IT. Plan ahead and always assume when you adventure that you WILL die; Have a backup plan if the worst case scenario occurs.