Retirement tax questions

This is a pension,  not a 401(k).  I did discuss it with the pension plan administrators.  At first I was told that there would be an RMD withheld that would be paid by check.  Then later I was told by another representative that the first RMD would be due in 2020 based on the IRA value at the end of 2019.  Presumably, there is no known value for the pension at the end of 2018 since the lump sum is calculated based upon my age, interest rates, etc  at the time that I actually requested the payout (which was in 2019).