Five carry almost all the weight: a homepage that states what/where/why-you in five seconds; a page per core service (one topic each — better for visitors and search); an about page with real faces; proof somewhere prominent (reviews, work, results); and a contact page that makes acting effortless.
Service pages are the workhorses most small sites skip — 'Water Heater Repair in Cherry Hill' can rank and convert in ways a generic 'Services' list never will.
What you don't need at first: a blog you won't maintain (a stale blog reads worse than none), and pages for offerings you don't actually want more of. Depth on what pays beats breadth on everything.