A brochure site is not a pretty picture: it is a sequence of decisions. First the visitor understands who you are in three seconds, then finds what they need, finally takes action.
The minimal structure that works: clear home, services page, about page, contact with form and map. The rest is optional if you don't know why it's there.
SEO starts with titles and headings, passes through structured data and speed. Without these three pillars, the most beautiful design stays invisible.