Exploiting a niche

Once you found your niche you „only“ have to exploit it and make money with it. You want to dominate your niche ranking on top at Google thus getting a lot of visitors to your niche site.

Content for this niche
Of course your first taks is to offer good content for your niche. It's not enough to create two or three articles about your niche and relax. You need both static and dynamic content like news or a blog. Static content can be strategy, rules or something else regarding your niche. You can't have problems with such a content unless you chose the wrong niche. You have to be creative with your dynamic content but here are two good options:
First of all you can bring news concerning your niche. If you have a site about women at poker then you should make news about women winning tournamens and so on. If you're directly involved in this niche (for instance you're a woman and have a site for poker playing women) there's nothing better than a blog. For instance you create a 2-7 Triple Draw blog on your site reporting how good or bad you're running at the 2-7 Triple Draw tables at the moment.
Your creativity isn't limited here!

Dominating Google
The big money comes from good Google rankings. Imagine you rank on top with the keyword „Poker“. Obviously you'll make plenty of money with this ranking. Now imagine that you rank on top of several keywords regarding your niche. You won't make bad money with these rankings either!
Of course it's nice to rank on top with one high trafficked keyword like „Poker“. But this is impossible for you and thus you should focus on several smaller keywords (so called long tail keywords) where you can rank on top making you good money. That's your goal.
And to reach this goal you need plenty of content around your niche and proper SEO skills which aren't part of this discussion here.

But how can you create content around your niche?
Just with repeating the right keywords at the right places. Don't term a headline for a 2-7 Triple Draw strategy article not „How to play“ but „2-7 Triple Draw Strategy“. Don't name a news headline „Howard Lederer is world champion“ but „2-7 Triple Draw world champion: Howard Lederer“.
This principle is not only relevant for the headlines. It continues through your whole content. You have to put your keywords in your content properly. If you find expressions in your content without any keywords you should consider changing those expressions that you can place some keywords. For instance „In this game...“ should become „In 2-7 Triple Draw...“. I'm sure you get the point.
Obviously you must not exaggerate this technique. Google would consider it as search engine spam and your readers will stop reading articles that are too crowded by keywords.

It's pretty easy to find a niche. Exploiting it, is a whole nother world. It takes much time and efforts especially with content. Take your time to create content for your niche and try to step into this niche. Then keep on working on your site (especially content and SEO) to become the leading authority within your niche and rank on top of some niche keywords.