Use the time you have between now and applying for flying sponsorships to gain vital work/life experience. Ideally some experience in management would look best on your CV but I appreciate your age is against you at the moment.
It doesn't really matter what field of work you go for but your local flying club is the ideal choice obviously. Failing that and most likely option would be retail if you're looking for quick promotion to put on your CV. Supermarkets usually have quick and easy promotional packages for those students who show interest. They need not know you are using it for something greater.
Team sports and anything else that involves working with others to acheive a common goal looks good on CV's too. The trick these days is to think outside the loop and try something that will get you noticed when the airlines/armed forces look at your application.
Best of luck.
VFE.