If it's actually 10 feet long, its probably not a true Mexican. Mexicans top out at about 6-7' fully grown, considered to be a dwarf species. Mexicans have somewhat of a reputation for being aggressive, I've worked with quite a few from the same litter- personalities of them are all over the place, some docile, others evil. Just like most other snakes!

It may be a central american boa, pics would help.

That being said, same captive care goes for mexicans as do retails as centrals, whatever. Don't let the warm side top over 92, don't let the cool side dip under 80. Humidity at 50-60%. Plenty of fresh water, preferably a large enough dish to soak. Maybe some vines for security, some of them use hides and others don't.