Just booked EWR-HKG in business using AA miles
then doing other small travels ending in singapore.
Booked SIN-HKG suites using city thank you points
and HKG-JFK using AA miles.

Traveling Solo so prefer a window

My question is

What is the best seat for 777-300ER four class set up in Business class for my two flights?
What Lounges are available (if any) in EWR?
What lounge can I use in HKG pre departure to JFK

Then
Best suite for SIN-HKG on an A380 Four class v.1
What is the check in procedure at SIN (separate entrance? what lounge do i get? do I get transported to plane via car?)
Even though I'm flying at 840 am should i still book the cook for a ribeye?

Any other tips would be amazing to make my first big points redemption a special one

Thanks!!