Minimum Techs:
Lvl7 archery (lvl6 for ballistas)
Lvl5 MT
Lvl5 IW
Lvl5 Log
Lvl5 Com
Lvl9 Info
Lvl5 HBR
Lvl5 MS
Lvl4 Con
With those techs you can make Ballistas and NPC farm
Medicine Engineering and Machinery up to you all 3 are good but get those others first
Anything else up to you “Good Luck”