Ironically, forums like this can be a very bad place for beginners to get their information.
The truth is, there is rarely if ever any reason to take the sideplate off of a revolver except to replace a broken part. I have a Model 1917 that was built in 1917 and issued to my grandfather during WW1. To my knowledge, after 100 years the sideplate has never yet been removed. Yet, it still functions perfectly. How can this be?
Simply, there has yet to be a single broken part; the action has been properly (that is, infrequently and lightly) lubed with a drop of light oil put just in front of the cocked hammer and another put inside through the trigger opening followed by working the action; and once every couple of decades the action has been cleaned by flushing out with a light solvent. These are the only internal cleaning and lubing steps required unless something disastrous like falling in a mudhole happens along the way.
You got lucky this time, but please, PLEASE don't go polishing anything at this point. It is far easier to ruin internal parts with polishing than it is to improve them if you don't know exactly what you are doing. Use alone will smooth things up nicely over time.