First time flying with stops?

So is Christmas season and I'm traveling from the U.S to Mexico for the holidays, I have already flying from point A to point B but I never have from point A to point B and C ( or city stops) so I'm nervous. How early have to be on the airport? Is one hour enough to switch from one plane to other? How long... show more So is Christmas season and I'm traveling from the U.S to Mexico for the holidays, I have already flying from point A to point B but I never have from point A to point B and C ( or city stops) so I'm nervous.
How early have to be on the airport?
Is one hour enough to switch from one plane to other?
How long can it take on immigration and still have to take the second plane?
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