How to lay out a new site

Im currently in the process of designing a website and could use some advice.

Im selling services for games consoles....and Im baffled as to how I should best lay things out.

Ill be selling various services, but I guess the most generic term covering all of them would be "console modding". So I was planning to get a domain with "console modding" in the URL.

I will then have various sub-pages, for example "console chips", so I'll have a URL off my main page with "console chips" in the URL. I'll have 3 different subsections in total.

In each sub-section Im planning to target the keywords which I have researched. So in the "console chips" section I'll target the 3 best key phrases I can come up with which are elevant for console chips.

Then, on my main page I'll have a link to each of the 3 sub-pages, and on my main page I will use the best key phrase from each of the sub pages....so the main page will contain 3 targetted key phrases.

Im planning some sort of wordpress theme to put this all together.

Can anyone advise if this sounds correct, as Im not sure if I should perhaps set up 3 seperate web-sites.

Thanks guys.

Maybe add some links in the sub pages that relate to other subpages. Example: on your subpage about "Console Chips" have links to not only your main page, but also to other related subpages.