How to create niche related websites ?

Hi !
I am working on some niche websites now.The problem is as follows:

1.I have one niche site ( with primary key word: nice red car - for example) and I'd like to create some more niche sites relevant to this site..................How to proceed ?

-to create a new related website with different keyword/domain, but to include my primary keyword "nice red car" in the content,

OR,

- to create many niche websites with different domains /keyword and this keyword "nice red car" to be included in the new domains and content?

Is this mean relevant niche websites?

Also when I write articles to Ezine, how to proceed – Is it necessary the keyword "nice red car" to be included in every article I make ........OR.......?

Thank You !

 

Just use wordpress to build sites quickly like i do

 

Maybe, but I got used to work with blogger and probably it will take me a lot of time to learn wordpress.
Also I am trying new strategy to work with landing pages pointing to my aff. link.
I create them very fast with blogger.
What are the advantages of wordpress, then ?

 

Thanks for the support and the good info so for regarding finding website niches..

 

Using word press is the best way to create niche related sites...

 

Select the niche that interests you and add more unique content on that niche , do seo ,thats it according to me