Please also get at least two cryptosteel or cryptocapsule to store your seed phrase.

When you initiate the device, write the 12 words on paper, do NOT type them into any computer device. Then slot the words into the cryptocalsule. Then burn the paper. Then hide the two cryptocapsules at two different locations, ideally in two different cities, better in two different states, better in two different countries.

Coinbase is an enemy of bitcoin. I don't know what is best in the US, maybe try Gemini instead.

Eventually you will want to have a bank account on Revolut and buy non-KYCed BTC P2P via Robosats straight to your self-hosted lightning node on a Start9 server, but that's a complicated project you probably don't want to embark on so early in your bitcoin journey.