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Definitely set a CloudWatch alert to notify you if the cost goes above a certain limit. And make sure you check that email regularly. It takes a small misconfiguration to rack up a hefty bill. Best to catch it early.
Other suggestion is to stay away from the console or command line. Learn how to use CloudFormation or, much better, the CDK. You can set up a full serverless application stack, run it for a while, then delete the whole thing so it won’t accidentally incur extra charges. It’s also a good practice so you can include the stack setup code with the rest of your code.
Good to see proliferation of presence detectors. Good for turning things off when nobody is around.
In my last job I got to play a bit with the SeeedStudio mmWave presence box. What was interesting (and a little confusing) was that it took multiple add-on boards for things like on-device fall detection (for elderly). For the time I had with it, it worked fine with HA: https://wiki.seeedstudio.com/mmwave_radar_Intro/