3 players and two substitutes (in case one or two of your players aren't in the final 12) from one team or from both. All upto you. I've simplified it.
Picking a batsmen, boer, and an all-rounder was a bit time taking and can be complex.

Now give me
1 team
3 players
2 substitutes
*Subs will only be used in case one or two of your players muss the final 12 after the toss.