Eljer garden garden tub drain

i acquired a beautful 6' fiberglass eljer garden tub that had never been installed before. i understand about setting it, and building the deck surround to install the faucet, etc. but what about the drain? the tub only has a center drain hole, no overflow hole. do i buy an 'L'-shaped drain with an overflow and cut a hole in the tub to accomodate that? can you tell i know nothing about this sort of stuff? i have a porcher deck mount kit with a 'telephone' shower, but it didn't come with the supply lines or drain. can you help? thanks, callie