Well atm if you want to discover a bit just don’t forget that archery is OP
take down 2 tree with an axe, make whatever you can with archeskill with the board, you will end with more than lvl10 archery, so you can after without problem pick the last bow, good arrow (not metal yet, you need mecha before …) and almost headshot everything if it come close after train firearm a bit (it level up with bow, yes)
Martial art sound new for you i think, pick krav manga (at creation of caractere) with massive stats strength (no care about dex) and even if early game it’s a bit hard (well not really if you don’t put ecumbrance torso), you can quickly doing over±60dmg/hit and a hit can be done every 25 (base move is 100, base attack with unarmed is 65, -2 encumbrance torse give -40 per attack). I don 't even talk about counter attack, block with arm/leg (so no dmg torso/head) and stun.
With both this you can go trougth everything in the game quickly even if you act stupidly.
Try get into the building maybe : Lab, Prison, FEMA camp … and, dunno if it’s the same as before but, avoid area with massive number of insect without a closed car, because if you don’t, you will end quickly with massive pain because of the speed of the mob.
Trying to help, ask if you want to know something more precise.