solo mining to monerod.exe custom diff?
I currently have 11 3900x workers.  I have installed daemon.  I connected xmrig proxy to daemon and I have successfully started mining (or so I think).  2 questions

1) how do I know what to set the customer diff too or should I leave it alone?  At first I set it 2500 and I received accepted shares every second.  I set it to 50,000 and the accepted shares were still coming super fast.  I bumped it to 200,000 and they slowed down a little.  I really have no idea what I am doing and I can't find and good documentation online.   If there is some please let me know.

2) How do I verify that I am working towards actually finding a block and getting some block rewards?  I was happy to see new jobs and accepted shares, but does this mean I am actually getting somewhere?  Please advise.

If you have some good documentation to help me in my solo mining I would really appreciated it.  Thanks.