Before 3 pm the boat goes from FW to WL to MK after 3 pm it goes from MK to WL then FW.
I've stayed at WL several times, but haven't gone to MK before the park opened. Last Feb. we had a PS at Fresh in the Dolphin at 8:00 am. The buses start running at 7 am and we were told to ask the MGM driver if he would drop us off at the Dolphin. He took us to the Dolphin and was very nice about it. I'm guessing about going to MK that early, but you might take a bus to TTC and then monorail to MK or they may have a bus that takes people to the MK for breakfast.(No bus from WL to MK normally)
I have found that most people at guess services aren't up on the transportation system. I would suggest that you call the operator from your room and ask to be conected to the transportation office or ask a bus driver. I'm sure it can be done, but just finding the person that knows is sometimes a problem.