I would say that in general its quite similar. The keys to succeeding are as always content related. Give your visitors quality updated casino content concerning all casino games.
The Basic Order of things remains the same
1) Keyword research
2) SEO friendly design and HTML
3) Writing Quality content + Obtaining good links
A question you should ask yourself that you probably didnt think of promoting poker is Do you want to create an “all in 1” site dealing with all casino games or go for game specific sites.
Hope this helps