What I’m trying to showcase is thus far is from the ‘beginning of time’, of Googles Time, to now, you see a pretty basic linear trend which is this: Google Likes Value.
Now, if you want the site to look good... you're still going to need a designer, but because you're asking the designer to customize an existing theme to make it work for you, what you're essentially asking for is for a semi-custom design.
WordPress is the 'platform' behind your website. When you log in to your website, you're logging into the WordPress dashboard. From there, you can manage all of the affairs of your site.