About domain names

Hey guys!

I just bought 2 domain names which I think will have a decent keyword search on search engines, but I have one question though.

I intend to use these 2 domains to redirect blogs like this:

myveryfirstdomain.com will redirect to veryfirstdomain.blogspot.com

myseconddomain.com will redirect to seconddomain.blogspot.com

(those are not my real domains and blogs, just something I made up)

Now, as far as I know when I index my purchased domain names on search engines, the content on my blogs won't be able to be searched because my blogs are not indexed, right?

So can anyone give me some tips on how to get search engine results to my purchased domain names, when search for content that is on my blog is made?

Also, how can I make my sites be among the top searches about my topics without spending money.

Thank you very much

Dillusion