another question - once I have created my graphql datamodel, and then created a graphql schema for Yoga, do I then need to make a third set of queries/mutations on my frontend? (using apollo) or can I share this somehow?

You have a schema + resolvers in Yoga, correct? From the front-end you can simply call those queries/mutations. You will need to write a template literal query/mutation (or use

.graphql

files) to pass to Apollo to execute.

That what my question - makes sense - thanks 🙂

No problem!