The VFD shouldn't need a separate power supply.

A 24VDC 2A DIN rail mount power supply should be more than adequate for the controller/controls, unless you're running anything that requires substantial current. However, if you've already got a larger current 24VDC supply, then use it. Extra current won't kill anything, unless you wire something up wrong.

For steppers, I'd always recommend a basic unregulated supply, but if you're 48V supply works, just stick with it.