SEO...Keywords ... Making my head spin

OK For the last 2 hours I have been looking for an explanation on keywords and I've read so much my head is spinning

I want to know if I have this right or not....

Say I have a Cooking Blog that I just started and put up 15 entries, I've been promoting the site now that it has some content (Since I waited until I had 15 by choice)

Now I want to "target" and I go to keyword tool and look up, Best Carolina BBQ sauce Recipe... Low Comp ... 500 global ... and 175 Local

So I now got to my Blog and I Freshly Write an Article/Entry Titled

"This is the Best Carolina BBQ sauce Recipe Ever!"

Then in my post mention "Best Carolina BBQ sauce Recipe" maybe 2 or 3 more times. and publish.

Continue to promote my blog and drive traffic to it.

Once Google or other Search Engines indexes my Blog again, I Will the be in the running to "Rank for the Keyword "Best Carolina BBQ sauce Recipe"?

2 Days later, Do it All over again with another Keyword? Or Maybe Write Another UNIQUE entry with "Best Carolina BBQ sauce Recipe"?

This is obvious Just an example, but I just cant grasp what exactly to do with a "keyword" once I find one related and I like and low in Googles Keyword tool!

If I'm Wrong, Can Somebody please Correct me, Or at least tell me that my 2 hours of research paid off! Thanks

Dizzy Dean20653