Retirement RMDs

I retired at the end of 12/31/22 and my income for 2023 will be significantly less than what I had been making. I know there is a special form to file with social security. When should this be submitted.

When I moved my 401K earnings to an IRA they required that I take a RMD at that time 4/2023. Do I have to take another RMD this year now that the IRA is in place?

I have a private stock that is not listed on the stock exchange and I have to do an "in kind" RMD? Can I lump that amount of money into other taxable 401K monies and make only one RMD request and not disturb the private stock monies?