You will probably have the best luck with species that are native to where you live. and herps that only need a water bowl will be easier than a water feature.
--at least to start
grey tree frogs (a favorite)
there is really no advantage in keeping exotic species if your budget is tight and experience low. even the common toad can be a great source of entertainment and delight in a simple cage. Make it a fancy cage with live plants and you will learn a ton and enjoy the tank more.