Two places to check out.
http://manuals.ootpdevelopments.com/...e=manager_menu
This is no different than past versions, so the manual will help you here.
I don't recall exact paths, but this is where you'll find "available jobs" and can click "apply to job" to get hired. may need comissioner mode on to get any job you want? or not, easy enough to remedy if so. That option is in this area of settings too.
Manager's office - settings tab - this is where you can delegate various things or retain control - from minors to ml level.
Also, under "global settings" of the league settings, there's an option call "legacy gm mode" this will ensure that even a controlling manager with a big reputation will not ignore your wishes for lineups and such.
http://manuals.ootpdevelopments.com/...e=game_options
again, all of this looks 99% the same in ootp24, so the manual will help here.