Who are you going to work for?
and where?
Most of the UK companies give comprehensive training.
You are likely to start your career by meeting and dispatching flights.
Would suggest that you are familair with:
24 hour clock
BST (British Standard Time) and Local Time
Phonetic alphabet
Principals of flight
If you have any contacts in aviation that could get you a current (or old) IATA AHM (Aircraft Handling Manual) you will find that this manual will give you more than enough background reading. I would not suggest that you go and buy this as it is expensive.
PM me with details if you do not want to go public.
GH