I agree with a lot of what is being said on this thread, but my 2 cents Most of the time I use double 1/32 or double 1/24ths I make a long cast and then sweep the rod. Depth and Speed are key factors, as is length of line. The Depth can be controlled by speed and length of line or adding weight to your jig. I feel that the fish that you are after long lining are reaction bitters or looking for food. so sometimes the speed can be fast or slow. Last week we ran double 1/24ths at 1.3 mph which is fast to me, we caught our fish about 3 ft deep in 8 to 9 fow. There could have been many different ways to catch these fish a single 1/32 pulled slow or a cork and jig. but we wanted to long line, and this worked for us. Yesterday we pulled double 1/24ths and slowed down to .6 to .7 mph and put the jigs much deeper and this worked for us yesterday. you just have to try different things, using double jigs allows you to use a lot of different colors and to be able to find what color they want a lot faster. The main thing is you have to get out and work at it there is not a sure fire way to do it. only trial and error. Good luck it will be a life time learning experience for you.