Hi! As a fellow non-hot-shot-programmer I’ll tell you that these boards have a bit of a learning curve, but if you’re persistent and can run a search engine, you should be able to get it to do most things.
I’ve never done anything with Pi-Hole, but the one thing I think you should know in advance is they do run hot. You’ll probably be OK with the heatsinks, since I think Pi-Hole is headless, but if you find them climbing above 60℃ I recommend a small fan.