One of the items you are looking for is the filter function.
I've created a similar spreadsheet here:
https://docs.google.com/spreadsheets/d/1tE80u93n3SLiXmiBSQ5tc65wFHw6xVoQVHZlKEYQpqs/edit?usp=sharing
in A9 you'd want to add something similar to
=filter(Players!A2:D100,Players!E2:E100=A7)
You'd also want to ensure the range you are filtering is in a similar format to the location it is going to (i.e. merged cells).
Now the spreadsheet will adjust the players based on the team selected in the drop down.
Hope this helps.