@NebbishHacker & @Gordon
Thx a lot both of you!
With your guidance I've now been able to try out my very simple model and it works technically, albeit it almost always shows "right" even if it should have been "left". This might very well be because I only had 10 samples of each which probably is far too small dataset, I'll look into this.
I had actually tried the Google Colab workshop but the quantized exporting always fails with "ValueError: the operator SPACE_TO_BATCH_ND is not supported by TFLite Micro", and as I for now prefer Edge Impulse for its simplicity, I did not dig deep into possible causes of the error message.
Yes, a tutorial would be nice! When I myself understand the process and get it streamlined I'll write the steps down as I'll anyhow need them later in my research. I'll provide them to you in case you might benefit from them.