CMS does have advantages but they are best suited for large web sites. Technically, if you know the basics and know how to optimize a standard website, then you got it made. Learn to do that first and strengthen your SEO skills before moving into CMS systems because you will just be making more work for yourself. Quick note....blog scripts are CMS and if you're creative enough, you can do a lot with blogs. They don't have to look so basic like we all see with everyones'
Just an idea...add a blog inside your existing html site and you can still obtain good SEO
