Do what I have done for the last few years.....let the game pick a team, or use a random generator on line to pick a league/team and go with whatever you get.
play it as a career proper, consider other job offers etc and see where u go. I have a 'career goal' in mind when I start, which might be achievable from the start or may need some career management along the way. Have just turned down an offer from Port Vale as I am only 18months in as Boston Utd manager!
have had great fun with Stoke City, Whitehawk, Cheltenham Town, Tranmere Rovers and currently, Boston United.