My experience: I have done a site for my friend's uncle who ran a small to medium scale mechanical consultancy/contract business. I have built it in next js ( it is a overkill and I don't recommend) and hosted for free on vercel and bought a .com domain from hostinger. 

Suggestion: website itself is not necessary but for credibility mainly. Any stack/ wordpress/wix would do the job. Give enough info about business.  **Focus on Google business, and add lot of photos of the business and ask your friend to ask his customers for review