People who claim to have Blackcreeks, Skullforks, Weir Creeks, Gay, Shorts, etc, really do not since those are all old lines and the original breeders of those lines have been gone for many years. What you really need to determine is what has been crossed onto those lines in the years since the founder of that line stopped actively breeding. No line continues the same way after the original breeder stops.
I would suggest that you look for pedigrees where you see the same hound names multiple times, indicating the pedigree shows line breeding or even inbreeding. If you see nothing but different names, which will be true of most beagle pedigrees, you have a very openly bred hound. A more linebred or inbred hound is more likely to perform and reproduce the traits of its dominant line, because there are fewer variables at play. The trick for a beginner is to decide what type of beagle you want, then find someone breeding closely (linebreeding/inbreeding) for that type of hound. Be prepared to spend time studying, visiting breeders, and looking at many different hounds to understand fully what you really want.