SarahJamieLewis on Nostr: I think probably the best place to start would be to build a rendering engine that ...

I think probably the best place to start would be to build a rendering engine that can support basic rss/atom feeds and a bare bones micropub client.

i.e. something minimally useful that covers both creation and consumption.

Soon after that you would probably want to start thinking about an extendable architecture to support activity pub variants, custom creation flows as well as taking small bites at rendering linked documents.