Best way to use App Engine and Firestore for external queries

I am working on a website that pulls data from an external API. I wanted to pull the data from the API and store it in my own database for use so I can streamline its use. From previous research it looks like I should be doing the following:

1. Use App Engine to query the external API
2. Store that data into a Firestore database
3. Use cloud scheduler to use the App Engine script to update the database nightly/weekly.
4. Use the database for use on my website

I am not sure how exactly to go about using App Engine for this use. Also, if there is a simpler way to do this, I would love any suggestions.