Well Dave ...lets say you are pushing use only enough weight to keep the lines from going under your boat ..try and keep the lines vertical the faster the more weight advantage is you can stop on a dime or turn in place... trolling lets say around 1 or 1.1 mph ya got out 75 to 100' 6lb line out and your fish are 12'deep with double 1/16 oz or single 1/8 oz should put you in the ball park ...but like I said all of that varies. If there is cover underneath you and you have to turn the inside lines will fish deeper on your turn and could snag ..speeding up in the turns could help. Say you are on Oconee lots of trees ..then pushing could be best,you now have eliminated that problem for the most part ..that is only one of many scenarios, mostly you add weight to get deep or slow down with the weight you have on to get deeper ..on average 1/16 or 1/24 is the weight you would use when fish are somewhat shallow ,but other times you have to be versatile . It don't take much to get started longlining but the longer you do it the better you get and the more you learn what changes to make and what works and what does not work ...100' of line out over trees and you stop the boat (don't work) you get me.