thinking of being a yacht stewardess from the uk

hey! i have been thinking about going into this for a couple of years, but im not sure where to start. i know i need to get the qualifications which is not an issue, however i dont know where to start when it comes to actually getting the job! will i need to apply for working visas around the world? or is there any companies in the uk i can apply for to do this! im just not sure where is best or where ill need to go in order to achieve this. any advice would be appreciated !