check with: midwayusa.com
Sounds more like a serial no then a model, 44 cap and ball (black powder) Need more info to identify.
Yes, Black powder guns are extremley dangerous a licence is definitely needed
yes
You need to consult a Black Powder loading manual
yes
yes, in some states
YOu need to see a gunsmith immediately
No
Yes.
To find the age of Pietta guns you would need to know the model and serial number, The blue book of modern black powder values has a section in the back listing manufacture dates based on this. Or let me know the info and I can give you the year made.
Black powder guns are not federally controlled and can be shipped by mail to you. There are a few places (mostly major cities that do restrict black powder, it is always best to check with local law enforcement first. You don't need a yard full of black suburbans and guys in jumpsuits.
Seriously ...if you need to ask then it most likely is.