Welcome! Lots of questions there. Pop into the black powder reference section and do some homework.

There are alot of options for you, and honestly you can get alot of different opinions - and all good. You might want to try something simple such as 2 pyrodex pellets and some 240gr-250gr (saboted) bullets (XTP, Speer, etc). Most guns will shoot this type setup pretty well. Or you can go to the newest powders and bullets - but its certainly not neccessary. I personally prefer loose powder over pellets.

Typically in hunting situations even with the most corrosive powders you won't need to swab between shots. For range work most like to swab to keep consistent. Full cleaning..again, alot of methods. Read the reference.