If I were you I wouldn't be paying any deposit for a start if you don't have all the funds sorted, as said by MaverickPrime.
I did all my training modular, took me four years as I was working at the same time to help get the money, as well as taking out some loans. You are only 21, there is still plenty of time for you yet. I didn't start till I was 24, finished my MEIR/CPL in September, did my MCC/JOC and got two job offers within three months. I saved loads of cash going modular instead of going and spending loads on an integrated (which I could never afford to do and had no interest in putting my parents home on the line for slim chance of getting a job).
Modular still works for a lot of folk. I am not making any bad comments about the integrated route as it is a good way...if you can afford it.