Get to know your local hunt, the huntsman and his staff, help out when you can and see what the jobs all about, gain there trust and ask plenty questions and learn.
Then if your still interested apply to go on the hunt servants list, with the MFHA and they will send you out a list of job vacancies, apply for the ones you fancy and ask the local huntsman or masters to give you a reference.
Best of luck to you.
LL.