Build a Website

I'm a photographer with an existing Drupal-based website, but wish to move to Wordpress. Current site: [login to view URL] This is happening as part of a wider rebranding I'm giving my work. I know what style and the navigation structure I would like for my new site, and also have a small list of new feature requests that haven't been possible with Drupal. Things like customers being able to view my availability and instantly book and pay for shoots online, and also maybe selling sets of Lightroom templates and workshops. I can provide a wordpress template I've found that represents the visual style I want, as well as line drawing mockups of the new navigation structure. While I've grown a small understanding of Drupal, I have zero knowledge of Wordpress. I would also appreciate a designer who may tell me if there are better options or solutions out there than my proposed navigation. I have a design background myself and believe that it's really important to be a great client for you to deal with, but I also highly value respect, positivity and not being talked down to. Other photographers I know have recently had a big SEO hit when getting their sites redesigned. I am currently top-ranked in google, and would appreciate someone with expertise in minimising SEO fallout. Hope that's enough to go off! Love to hear from you.