Try starting with what you enjoy? What money do you need to earn? Are you just in it for the money? Will your Ph.D. help anyone else? Can you afford to do a Ph.D.? There are so many questions you need to jot down and answer way before you get down to the course and where to study!  I was told after my first first class gons degree to ‘hurry up do your masters as you can easily do your Ph.D. with your brains etc etc!  Thankfully I don’t need to prove anything to anyone! So my advice after two degrees with firsts is to take your time!! Blessings RevRy