Gobble - A good starter is the CVA Optima Pro if you're looking for an inline. These are well made and accurate rifles. As for a scope, a good 4X would be plenty. As for powder and bullets - Pyrodex RS would be a good start and a bullet in the 240 - 300 gr range. Best to try several to see which one shoot the best out of your rifle.
Word of caution, if you want to check out the used gun section for a muzzleloader, invest the $7.00 or so for a CVA bore light so you can inspect the bores prior to purchase. A muzzleloader is not very forgiving for inadequate cleaning and care and can corrode quickly. Another area to examine for corrosion is the breach area.
Good luck and welcome to the forum.