Hey Bucknife, welcome the camp.
I have a Pedersoli Frontier in .50cal. and like it alot. I have shot all my life but new to all this BP stuff, been doin it a couple of years and have learned 90% of what I know from these guys at this forum. A truly HUGE amount of information here that has taken them a lifetime to learn. Listen to these guys.
In answer to your questions, read seasoning barrels in the Flintlock forum. Somewhere, I can't now put my hands on the source, I think the land-to-groove measurment is .006".
When I got my rifle, I had already planned on shooting at least 500 rounds through it to so the barrel had a chance to settle down. As I got closer to the 500 end of the shooting there were much less flyers compared to the new barrel.
I myself am alittle apprehensive about using scotch brite pads in a barrel, shooting 500 rounds is much more fun.
I clean the barrel by first swabing out with patches soaked in solvent(windex, soapy water, try some and pick your favorite,) then very hot soapy water( the hotest tap water, 120F is good enough,) and a newish metal bore brush about a dozen strokes at least. Then, while the barrel is still nice and hot, run some dry patches up and down to dry it out and finaly I coat the inside with some heavy weight machine oil. While the barrel is cooling off, I disassemble the rest of the rifle, clean and reassemble. Before shooting the rifle again, the barrel is swabed dry of oil then off to the woods.
The little book you get with your rifle will tell you how to work up powder and patch combinations. Ask at this forum for the best answers.
Hope this helps, Allan