I certainly wouldn't go by the month! Get paid at least weekly.
Maybe you could talk or email Tony Rome. He has a nightclub in Cozumel and would be happy to give you info.
DonM
Definitely go see Tony; he's a great guy and has a fine restaurant and a stage all prepared for a OMB. He's two blocks down from the the main street by the flags in the center of oldtown. Ask around, many local merchants know Tony personally. Tell him Cass and Phyllis say HI...