I'd like it to be the next way:
King - Jon
Queen - Daenerys (if Jon and Daenerys are not brother an sister in some way)
Hand - Tyrion, cause he can do it the best (actually from here I have found he is the main character but I think this is a bullshit)
Master of Coin - Petyr Baelysh
Master of Ships - Davos
Master of Laws - Varys
Grand Maester - Sam