Scaredy,
I highly recommend you contact PRO GATES in Fallbrook. 760-723-1389. Roger has been in the industry for many years. Nice guy.
He deals with the motor & install. Ask him questions about what kind of gate you should buy and who you should get it from.
There are several guys in Fallbrook that design & make the gates, Roger does installation and repairs.
things to consider:
Depending on width, whether you need a single gate & arm OR a dual OR a slider & Whether to go solar or electric.