Hi and welcome from northern New Mexico!
Flintlocks eh? You do realize that they are more addicting than crack-cocaine...
I know that you didn't ask for my advice. But, if you did I'd tell you to go to the Kibler website and order both a Southern Mountain Rifle (SMR) and a Colonial in your choice of calibers. You'll probably end up doing that eventually anyway. If you are going to jump in, might as well do it with both feet...