For your own IRAs (not inherited IRAs), enter the fair market value of ALL your IRA(s) at the end of last year. This becomes your beginning balance for personal RMDs.

For an inherited IRA, enter the FMV at the end of the year the original owner died. This becomes your beginning balance for inherited RMDs.

Which table do I use?
Sole beneficiary is spouse more than 10 years younger → Joint/Survivor
Inherited IRA → Single Life
All others → Uniform Life