There are many strategies and many different ways to go about marketing your online arcade; the trick is to find the best way that works for you.
The marketing portion of your web arcade journey is another journey in itself; however, with enough learning and experimenting, your marketing campaign may have the potential to help your arcade grow into a profitable hobby.
There are many SEO/Marketing resources available on the internet. There are also many books on this topic. I would recommend checking out Amazon.com for some helpful reading material.
To sum up this portion in marketing, we will close by saying their is no right or wrong way to market your arcade; it will be a never-ending learning experience; and it may take some practice to find the right strategies that fit your personal needs.