What is the keyboard shortcut that will allow me to jump to a specific label folder in Gmail?
AFAIK, you cannot choose a shortcut for a custom label.
Anyway, you can access gmail default label with shortcuts :
^f sent mail
^t starred messages
^u unread mail
Or, you can use
l to access the label menu (described here) and then choose your label.
And btw, here is a cheatsheet for Gmail shortcut.