I did this a couple of years ago with FM 2009!!!
Started unemployed, loaded 10-12 leagues (slow) but fun!
Being Scottish nationality it ended up giving me the Forfar (small scottish coastline village - famous for it's banjo players and straw chewers)
After 2 promotions in 3 years to the Scottish First Division i was in a relegation battle and stuggling...
At begining of December year 3-4 i got the sack! gutted all my hard work, setting up relationships to loan players, staff and training working well... what a waste!
Now i got offered a few jobs down sowf in league 1 but i rejected them all and took the Abroath (Forfar's neighbouring banjoists) job.
Promoted with Abroath from the Third divison and Forfar were relegated.
Year 4-5 Second division for a second time! - Success i won promotion via play-off and Forfar relegated for a consecutive year!
Return of my promotion to SPL challenge - mid season sitting mid table... looking okay, i had already accepted that my main goal this season was to bank as much money as possible and stay up!
January transfer window and in my news in tray was a job offer from SPL bottom feeders Livingston!!!
Offer accepted and i was in the SPL - saved my new club from relgation and was offered the Scotland job.
2014-2015 season... finished a respectable 4th and runner up in the cup! (very frustrating!!!)
2015-2016 season... finished 2nd to Celtic and no where in the cup.
2016 Summer - Euro Championship Winner - Scotland 2 Italy 1!!!!
To date my best ever career in FM!!!!
Nothing beats starting unemployed and working your way up - more satisfaction!
Problem is though unlike real life managers you become attached to the team and you don't want to leave them, but i strongly suggest leave and try different leagues!
Recently i left a English team for Brno in Czech and what a difference in the 3D game footage the touch, technique and passing a lot better and more enjoyable to watch!
Hope you enjoy the read!