Start a career that maximises your dosh intake and then ditch it when the time is right - that way if the sponsorships amount to nowt you will have some funds behind you to use later on for professional training. Wouldn't advise doing a mind-numbing part-time temp job (i.e. data entry) while waiting for the flying to take-off coz that only adds to the soul-destroying nature of the industry at present.
sB