Couple ?'s From a Newb

I have never been involved, or know anything about Internet Marketing.
I have heard the phrase, but just figured it had to do with selling ads on websites.

I came across Niche Blitkrieg, and read all the of the sales pitch. I then looked around a little for other IM sites, but the Bltzkrieg seemed the best.

Somehow in my research, I thankfully found this forum. I have seen the references to the War Room, and how helpful it can be. But am still very skeptical of the whole IM concept.
With that said, onto my questions:

1. I haven't found anything current on the this forum about Niche Blitkrieg. So I would like to ask if this is an out of date concept, and/or are there better routes to pursue?

2. Is Niche Marketing niched out? I would assume by what I am reading that this has been going on for a while. So, is this something that is heading towards a "tapped out market" sort of thing, or is there still plenty of opportunity ?

3. After purchasing either the War Room, or Niche Blitzkrieg (or any other you may recommend), how much more investment is needed to do it right?
I have seen things like wordpress, and market samuri, etc., so am trying to get a baseline on cost.

4. Last dumb one... On the Niche Blitzkrieg, it mentions buying a domain name for $10, and then says it's approx. $10 a month for the site. My question is 2-fold, is that $10 per month for each and every site I create, or is it for multiple sites for the same $10?

Thanks for anyones input and guidance!
Craig