You need face-to-face Customer Service experience that's what the Airlines look for. Don't try and re-invent the wheel when it comes to Cabin Crew recruitment. there are plenty of people before you who have tried. Save your money. You will need it if you do eventually get a job. Medical assesments, drug and alcohol screening, airside pass, shoes, make-up, hair, car parking, training, uniforms, transport to work etc...etc are the types of things you may have to pay for. Customer service experience and life experience just focus on that for now.