Regarding the QR codes. I understand the reasoning for a different page than home so you can track the effectiveness. Do you think they should go to an offer of any type? Or just a page that expands on and id directly related the marketing message?
you are not that much older than me. And about the age of my older brother. Both of us have self taught computers.
Use various tools. Chrome browser and fire fox have some good tools. In particular is inspect element. When you click on an element of a page you can see the code for that portion. You need a basic simple understanding of these workings. Yes it takes time.
Read and read more.