Kayak Trolling and Lead core

[dannyplug1]

I am in the process of changing over from a paddle kayak to a hobie outback. Now that I can control my line while I free spool I would like to try trolling with lead line. I have a bait caster with a level wind but I know it cant take more than two or three colors and some backing. First question how much backing do you think I need? 100 200 yards etc.? secondly if I have to go with only two or three colors how deep can I reasonably troll (is their a rough formula for depth to amt of colors out?) I know that with the kayak I have greater control of the speed of the lure as opposed to a conventional boat. Lastly if I decide to really get into lead trolling could some one recommend a reel and is it worth it to get a reel that has a line counter thanks Charlie