You can always contact a dev that knows how to create one, though that would be the most expensive option there is. I believe there are a lot of whitelabel casinos software that can be modified to fit your altcoin. Though I would rather just stick with the popular altcoins as there wouldn't be much interest if it was a different one.t
You will either lose everything or never get a hit. If you put even a dice game together by yourself, with little knowledge and just a quick learn and copy and pasting code, then within the first week someone will have botted or scritped the site and drained it or simply injected code and drained your wallet day one.