Can bestbuy geek squad help setup my tv with sound bar, CD player, etc?

Yes

Yes but it may be easier just to YouTube it.

Yes they setup with a charge. But sometimes bestbuy is fussy that u need to make purchases from them.

Yes, typically no matter where purchased. There is a different price for just about any service you can think of

Yes, after purchase. U can always call them & ask. There is an ext just for geek squad questions

Yes, after purchase