There are books on how to build altcoins but I don't see any in-depth guidance on how to build a gambling site.
It seems to be all trial and error.
If you know of any technique or site or forum I would appreciate hearing about it.
Are you creating on your own?
Do you have knowledge on programming?
If yes, then you can code it on your own but if not then dont bother too much yet creating one would be complex
and let do the work into those specific developers and just simply pay it up.