1st off, I would make sure you have a nice crown on the muzzle - by nice, something like this:
I would not even try the tin patches, under .018" and that one, only with the .495"balls.
With the .490's, nothing thinner than .020" to .022" will work fine, likely.
Hornady or Speer balls will work just fine. There are other places to buy balls, like Trackofthewolf and others
I do not know about in the States
If this rifle is for hunting, then Track's mink oil will work fine, as will 100% Neetsfoot Oil (not compound)
You will need an adjustable powder measure.
If this is a hunting rifle, I would start at 80gr. 2F (I prefer 2f in rifles .50 and over - others prefer 3F) No, 2F does NOT foul
more than 3F with the ball and patch combinations I noted. If you want to use 3F, then I would start at 75gr.
You will likely find your most accurate load within 20gr. of my suggested starting loads.
If this rifle is for target shooting, then I would suggest a water based lube such as winter windshield washer fluid with a bit of oil
(neetsfoot oil) added to slow evapouration in the warmer weather. If does not hurt the shooting during the winter time, either,
which is why we use winter windshield washer fluid - it does not freeze on the muzzle like straight water or spit can.
Once you find your best "load" using the powder measure, make a single powder measure that throws THAT amount and attach that
to your horn strap. Write down for record keeping, the load for THAT rifle in case you lose the powder measure you made. Powder
measures can be made from horn, or range pickup brass cases, or from inter-fitting brass tubing from a hobby store. A simple wooden
plug can be CA'd into one end, with a drilled through hole for a thong.
The 2 on the far left and 2 on the far right of the top row, are from brass tubing. All the rest are range pickup ctg. brass with the rims turned off
and a screw-eye soldered into the flash hole.