Trust me, you are better off working or volunteering with someone who has one. Crested geckos and beardies are TOTALLY different from alligators.
I keep monitors and work with large ones on a regular basis, and i would not even try getting an alligator. I recoment doing research on some smaller monitor lizards like savannahs, tree monitors or other "small" monitors. Start at varanustalk.com and savannahmonitor.net even if you're not that into those lizards specifically, there are experts on large lizards.