The good thing about your website is that layout is simpel and easy to navigate, but it lacks pictures, especially in the menu. The colours are a bit too dark for a casino website and it needs more content. If you ever been to Las Vegas for example you would see lights, colours and so. If I were you I would take away the banner ads for each casino and put instead their logo up with a text link: Click here to visit the casino – text links work much better as investigated by seo masters cause banner ads appear to a bit too advertising, too selling.
You should be proud of your site as I understood this is all self-knowledge and learning. Good luck with your site and have fun making it!