I wrote an extensive beginner’s cookbook for FFmpeg. I hope this guide on its own allows the reader to work out how to use FFmpeg for a variety of use cases, but if you want a quickstart or to adapt this material to your use cases I can offer tutoring on FFmpeg use.
We can go through the recipes together and I can answer any questions you have on them and talk about how they could be adapted to your use cases. And if you send me the things that you are trying to do with FFmpeg ahead of time which aren’t covered by this I can prepare recipes and at them to the book.