How to be effective as a low level in T2+ ?

[Aanathema]

For many things you can search 1) forum and 2) the wiki, which is located in the middle on the top of the page.

https://wiki.returnofreckoning.com/index.php/Crafting

Read it and be careful when choosing your skills because as it is said on the wiki page
Apothecary goes with either Cultivating or Butchering and
Talisman Making goes with either Salvaging or Scavenging.

Apothecary = pot making
Talisman Makin = talismans (stats on the free slots of armor/weapons)

All these NPCs which will teach you these professions are located at the market I think in each capital city.