Any particular things I needed to know to maximize how I use facebook to my advantage as a VN maker?
What you have is a personal Facebook page. This is to be used only with people you know personally. A personal Facebook page, will get suspended/banned from Facebook soon (or when it grows large), if you use it like this.
You can't add to many "friends", or use it to promote things. 5000 friends is also a limit for personal pages (but you get banned much sooner). You also want to keep your family and friends personal things away from crazy fans.
Facebook also has business pages (formerly known as fan pages
) and group pages (similar to business pages, but moderated and owned by the community). Facebook renamed fan pages, because people will click on "Like" more likely, than on "I'm a fan". But essentially these are still fan pages. All famous people use business pages.A Facebook business page is what you need.
These are quite similar to personal pages, but instead of "everyone is friend with everyone else" system, they use a "fans follow idols" system. Unlike personal pages, you can create and manage as many business pages as you like. You can have a different page for each business you own or interest you have (one personal page per person is allowed, no limits for business pages and groups). A different FB page for each game page is fine. A business page also gathers statistics about your visitors, which can be very useful. Apart from these differences, business/fan pages are used pretty much the same way as you would use a personal page.
A group page is similar to a business page, but groups can grow much much larger. However, when a group page has a large enough following, you loose all moderation options. Groups are usually created by fans of something or someone (not business owners, bands, ...).
One of the most interesting features in Facebook are Facebook Ads. Sometimes they are very expensive, sometimes they are very cheap - it all depends how targeted your ads are. Obviously, these are not an option for promoting free stuff, but if you want a lot of very target traffic overnight (like *literally* overnight) - your budget is the only limit. Facebook Ads allow very specific demographic targeting (for example: 18 old girls, from the US, that have 'VN' and 'anime' entered as one of their interests in their FB profile). If there is little competition targeting the same demographics - FB ads are very cheap.
I don't really use my personal page (I hate Facebook just as much as I love it) for personal stuff. But I have many business pages and I use FB ads sometimes.
How do I become famous in Facebook?...
Half of the internet is on Facebook these days... I'd say you are famous in Facebook already, you just don't know it yet.
To make a business page in FB - http://www.facebook.com/pages/create.php
then select any option, except "Cause or Community" (these are groups). You can have a business page for your website too.