Question about Jamroom Import 4 to 5
Installation and Configuration
Download and install the jrImport module on a JR5 test site. You can then check out all the options under its Global tab.
Basically, you can select whatever you want to import, so yes, you need to import artists, members and users first, then you can run it again just selecting songs, or whatever.
You can filter out artists/members with no image and/or no uploads. It doesn't check for inactivity but that can be simply added to the script. I could advise you on how to do that.
Artists/members on a cluster are ok - it'll find them.
hth
Pa