There are lot step you need to do before start a gamble site :
1. A lot of bitcoin for bankroll
2. Your own gambling script (to prevent bug & backdoor from some script created by someone)
3. Decide your hot wallet & cold wallet
4. Securing your website & your bitcoin from hacker
5. Set maximum win to prevent bankrupt
6. Made some unique gambling game
7. Prepare to promote your site
8. And some free bitcoin to some user


I thin that's enough, and faucet  (from 250 to 2000 satoshi is reccomended)