I worked in an office doing admin sort of stuff behind a computer before I got my first job. In hindsight, I should have applied to be ground crew at London City Airport as it was closer to where I lived. I just took the first job I got offered at the Job Centre to pay the bills.
On the weekends I did parachute dropping in a Cessna C206 which kept me current.
I would say to get any job at first to pay the bills then start looking at related jobs to aviation (flying).