All the major Euro leagues as playable plus a couple of smaller ones like sweden, scotland, poland and belgium, (always down to the bottom playable league) the rest i put on view only but depends on where you want to manage and you can add/take away leagues as you progress through your career.
Day 1 for me is always look at the staff, you wont have many so you need them to cover as much as possible and try to get an assistant with as high judge player ability rating as you can - for realism purposes, if you didn't want to search , place a job advert and hire the best person that applies.
For recruitment Trials are key at lower level management rather than scouting as your unlikely to have money to throw around at your first club.
And finally, for lower league management - always tracksuit manager - feels weird seeing managers in suites in the lower leagues lol