Is this a correct checklist for a first time raspberry pi?

I'll be buying my first raspberry pi and decided to go with the 3 B+ model. Just to make sure, besides the model itself I also need to get:
– Aluminum heat sink

– A compatible Power Supply

– A case for the Pi

I have a spare HDMI cable (It does take a regular one right?) and ethernet cable so I don't need to buy those and should have an SD card somewhere for it. Anything else I'm forgetting I should also get with it? I intend to use it for DNS and network wide ad blocking.