You will be ready for the crypts when your armor is at 10, not level 10, but 10 total points or higher. Look to the number at the right side of your inventory. That will be upgraded deer armor, or a few pieces of troll armor. After that you have a decent chance.

The club is the best weapon to use against skellies (other than the stagbreaker, which is also blunt). If you're under armored, you can lead greydwarves to the ones you find standing around towers and outside crypts. They will fight each other and then you can pick up the loot or finish off the winners. Figure out the timing of how long they go between attacks and dodge, block or step back. Instead of tanking, try not to get hit as much.

Trolls seem impossible at first, but they can't cross ditches, and they have to walk the long way around fallen trees. You can keep shooting at them while making sure they don't catch up to you. It's not easy, but it can be done. If you've dug a ditch with vertical sides around your base near the black forest, you can handle the trolls when you lead them back there. Or you could dig a troll trap that gives you a protected place to stand and lead them back there. Watch out for flying boulders. The entrance to some of the crypts have a sheltered area in front where you can hide from troll attacks too.

Don't go after the pink nests until you are properly geared. Avoid them for now. You will need them later.