If you're going to use BH 209 you can't use any of the cleaning products. BH 209 is like smokeless powder in that you need to use the same cleaning products you use on CF guns. Black powder and the other subs use water based products to clean it up. They'll make a mess with BH 209. Good old Hoppe's 9 works good for BH 209. Use it to clean the bore and breech plug. Yes, you'll need to buy a breech plug designed for BH. CVA makes one, and Western makes one. I like the western one better. You can get it from Carlos.
I also see T7 primers. They're designed for T7 and other subs, but won't work for BH 209. It need s a much hotter primer. CCI mag, Fed, and Winchester are all good, but it has to be a primer made for shotguns, and not muzzleloaders.
Anymore questions you can ask over on the traditional muzzy forum. We love to help those new to muzzleloaders.