Welcome to the Q&A Forum

I would recommend the Keyword Tool that is part of Google AdWords. It is free and allows you to search for specific queries and see how popular those search terms are in specific areas.

I would agree with Marcus on this one.  The first thing that you would want to do is plan ahead think about your niche and think about who you are advertising too. I would definitely suggest creating a wire frame of what your website will look like, what pages will social media links(if any) will be on your website. The most important thing you can do is plan accordingly and create a wire frame then a sitemap, and go from there.