What types of Topics do you like to see on Niche Blogs

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I have just started my first blog on www.blogger.com and was wondering what others yalk about on their niche blogs. Mine is about a specific motorcycle line (Suzuki Sv).I'm new to this and was wondering do people just talk about things they have seen in magazines and on the internet, and personal interests related to that topic. And should I post videos that I like about that topic from places like youtube. Lastly how can I make adsense work for me considering I am so new at this. Check out my blog http://svrider88-sventhusiast.blogspot.com