How to start preparation for this job
start with an amazing CV if possible take help from professional.
your CV id the first impression the interviewer will have of yours.
have a good personality and a perfect timetable in life. be systematic so you don't be late/miss out on workdays.
it is very important to be confident and focused.
impress your boss and make sure you are always on the good side. sure helps for promotions.
All the best