If you arrive too early, security will tell you to come back at a designated time. Usually 10. 930 seems to work well for arrivals.
At that time the unload is winding down, and there is at least 1 if not 2 porters on the curb, with a large luggage cart to take bags. If you drive yourself, they may make you wait in the lot, or they will hold you at the gate prior to opening the terminal. Depends on how well things are going.
As far as check in times, they will not hold you to that. If you arrive earlier or later, they will not tell you go stand in a corner. Theyll check you in at what ever time. In all honesty, there are some people that will have say a 1pm time, that get there at 10, because they are taking a private shuttle from a resort, or from the airport, and they cant get the 2 times to match.