He is my 2 cents worth based on my experience with website designs.
I myself started a few years ago not know coding thus not being able to design my own website as many thousands out there everyday.
Finding a website template/designer is the most easiest thing online today wheather it be free or having to pay. I myself have lost a few hundred on different templates thinking that they where better than free ones BUT as I eventually found out paying for a website template is not the main issue as many would do so thinking the same thing as me.
SO what is the main problem with templates online?
It is expect and trusting that you will get support or be able to find a developer which will help you build your website from that template that you either got for fre or paid for (no matter which).
The first thing a new developer is going to tell you is get rid of that crap I will start a new one from scratch. So there you have lost money already on buying a template.
Then there those that sell templates who do custom designs; They charge a fortune and are I found very unreliabe as I have been cheated by many of them not completing the work one they get paid.
HOW to solve this in my point of view!
Be a trusted designer who can design and code websites from start to finish expecting and understanding that every new user doesn't know coding so they are relying on you 100%. This is where the biggest issue is finding a trusted developer.
NO Offence to you but as you have clearly stated you do not do programming so what you are attempting to do is sell something with no backup what so ever once sold as you cannot expand on what you offer.
My suggestion is get yourself together with a programmer first and work together as a team so that when you actually do sell a template you can also offer the rest of the package which is building the actually workings of the website.
Be true to your support and be there when they need help. If you can deliver a full package then you will with no dout just become like many others and ignored.
Remember there are millions of templates online. there are only a few trustworthy developers online and I haven't found one yet.