Wanna Know Requirements for trading futures

Hi,
I am looking to understand how to trade stock futures in USA. I used to trade stock futures in India and know all about the risks associated with trading stock futures.

What I wanna know is the following.

1) Where can I trade stock futures (example APPL, GOOG)
2) What are the lot sizes (I found out its 100 ... it that correct)
3) Do stock futures trade 24/7 (Sun - Fri) or 0900-1600 (Mon - Fri)
4) What are the initial margin requirement for opening a position per lot
5) What are the other costs associated ? Carrying fee ?
6) Which are the best platforms to trade stock futures.

Thanking everyone in advance
 
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