Leadcore is very speed and current dependent on your dive curve. Look at where you plan to use it, and the max depth you will likely need, and set up your rods accordingly. My deepest spots are 30 feet, so I typically put 7 colors on my reels and fill the rest with backing. Fishing suspended fish in summer, compared to fishing deep flats or deeper old river channels are different games. I fish a ton of leadcore in spring and fall for eyes, as well as lead for salmon in summer, and they are different games. For both, I run braid backing because it allows you to put more backing on the reel over mono. Mono will work, but IMO you are way better off with braid. Fishing suspended fish, I will run a fluoro leader of about 20 feet, attached to the braid with an albright or willis know. If I’m pounding bottom for eyes, I run an 8 foot leader of 20# braid connected with a small barrel swivel to prevent twist if you pick up a leave or weeds. Nothing ruins leadcore faster than twisting it up from a fouled bait.
Even though you can count colors, colors fade and snags cost you a few feet of core now and then so I prefer a line counter reel. Makes repeating your setup much easier than counting colors, and sometimes, maybe you’ve had a beer or two, and counting colors isn’t super accurate.
For rods, the longer the rod you run, the better they need to be so you can read them, especially if you plan to run small floaters down to 20 feet of water. Not a lot of action in those baits and it can be hard to read what’s happening. 5 foot short rods are much easier to read, and you can get decent rods for 50 bucks. A good 9 foot rod you can read is going to cost you a lot more.
Lead core is a great tool to have in then arsenal, and many days in fall, it saves my guide trips when the jig bite just isn’t going. Clients often say they don’t want to troll, but when you box 10 fish for them in the last hour on a day when the jig bite is tough, they all ask why we didn’t troll more and they all want to know what to buy for lead core setups.