Looking at the 650.
As the title says what is the minimum needed to begin loading safely and effectively.
Secondary is don't buy abc from Dillon buy this xyz brand because its better than Dillons.
Here is an example https://pistol-forum.com/showthread.php?20953-Dillon-RF-100-Automatic-Primer-Filler
Third is what options are nice to have but not necessary.