Just coming back here to say after a few days of applying the ULA fix (with the help of a far more technically-capable friend) the Pi-Hole is working! Excepting Youtube, which as I understand is a common issue. Thank you so much for your help, me and my family's browsing experience is now a little bit better.
Hi, thank you for your response but I just marked Bucking_Horn's last answer as my solution. The problem has been solved. Again, thank you for taking time to respond!