https://docs.google.com/spreadsheets/d/1k1bDNJGNGvzmJVZpDiTQVYQooOaPxwn7sh8_1ROWHFs/edit?gid=0#gid=0This is a good point of reference for white items. Do know that during well events that are good, they can increase in price. For example, I was selling T15 white axes for 240 during the last well event even though this spread sheet says 150. Good luck and welcome to the hack and slash.
Also, join a guild that pays for earned guild points. The one I'm in, Knights Templar, pays 50fg per GP you earn.