Most spools of lead core come in either 100yds(single spool), or 200 yds (dbl. spool).;although some of the better great lakes trolling stores have bulk spools in excess of 1000 yds. If you can only afford a couple rods, spool them with 10 colors and let out different lenth of colors to achieve different depths.(about 4.5 ft depth per color). If you can afford the time and have space, use 10 color, 5 color, 2-3 color. I use 15, 12.5, 10, 7.5, 5, 2.5 on my charter, but even with a very large room this many rods take up an awful amount of space. I retie new leaders often. Leader lengths are your own preference. I start with 70' and run them down to about 15'-20'. The fish still bite em. I only respool the lead core when it has too many splices or shows too much wear on the sheathing. I use 25 lb. test backing. Take two identical reels, put on your ,leader, then lead core, then finish filling it with backing. Tie it to second reel and transfer it to put the backing on the bottom; then add your leader. If you have a line counter, you just found out how much backing to use! Rods are your own preference also. I prefer 9' medium action. Good Luck!