Update: a test on https://cluckin.net/ at: https://www.google.co.uk/webmasters/tools/mobile-friendly/ shows there are multiple problems. Options seem to fix include: (a) You could address the problems one by one: this route might be lengthy and stressful. But if you like learning about coding, aren’t in too much of a hurry, etc., why not go for it. Or (2) get a consultant into help. Clearly, there will be additional costs for this option. Or (3) choose an existing bought theme from GetPublii.com — that is already mobile compatible (to-date, they all are :-), then focus on getting your content into that theme, and and including your various ad modules, etc.
My vote would go to (3) as this probably would get you up and running sooner, keep everything under your control, is probably cheaper, and should allow you to get back to the real work of a business website: to make it work for you commercially.
My other suggestion if speed and website quality is your thing, if you do opt to use one of the existing GetPublii.com themes, apart from the different various layout options and CSS changes you may make for colour choices, etc., unless you know what you’re doing, I suggest don’t mess too much with the coding. Why: all of those themes tend to have been designed to a remarkably high standard and GetPublii.com fix and tweak them over time to make them and Publii itself better and / or compatible with a changing web. So all this helps save time for you so you can focus on your business.