Well, there are a couple of things you need to do.
On your brand new domain it's very important that you order a massive (and I mean large scale) xrumer blast. At the same time, make sure you have someone to blast at least 15K comments with scrapebox. PR doesn't matter, think quantity over quality. These should happen right around the same time, it makes it more effective. Make sure to do this within the first week of buying your domain, this will help get it indexed.
For onpage optimization, make sure you mention your keyword at least 20 times per every 100 words. Here is my super secret tip, so take notes on this one. Do a paragraph of just your keyword. Type it consecutively about 300 times. Here's the kicker though. Make sure the text blends in with your background. This makes it undetectable to visitors for that "less spammy" look. And when google and the other search engines see that you mentioned your keyword at least 600 times, they will know how badly you want to rank for that phrase, and stick you right on the first page.
I don't like sharing my secrets, but I thought it was time to tell the world. Using this method you will probably occupy the top 3 spots on google with your best 3 pages for your keywords. The competition on the keyword really doesn't matter. I just ranked #1 for the keyword computer using my method.
Go ahead guys, now that the cat is out of the bag I am sure someone will copy and past this into a PDF and be making mad money selling as a WSO. It's cool though, anything I can do to help!