I have found this video as a good starting point for LRGB processing in Photoshop
https://www.youtube.com/watch?v=b9ePip4rdsI&t=1046s
I am sure there are many better/more advanced ways of doing this but I have been overall happy with results from following this.
The other thing I have found helpful is using Pixinsight for calibration, registration and stacking to get my masters before saving as .tif files and using PS. I have found the results to be superior generally than using DSS. I purchased the eBook version of Warren Kellers Pixinsight book to help guide me through those early steps. Generally I have found PS to be easier and produces better results for minimal effort than PI once you have your masters sorted.
Malcolm