I bought a mini-lathe over 20 years ago and it has been a great (relatively inexpensive) tool for learning many of the principles behind accurate machining. A benchtop mill came much later, but, due to the experience I gained from the lathe, I was able to start making actually usable items not (too) long after I bought it.
I understand that you want to jump into CNC, it's an interesting technology. And sort of a rabbit hole to dive into. But I highly suggest starting out a little lower on the learning curve. The things you learn will serve you well when/if you decide to proceed into CNC. You can always sell your manual machines to help fund the upgrade: or use them to make the parts needed to convert them to CNC yourself. When I first started on this road I would never have thought of upgrading my machines myself, but now the primary consideration is: will I really put that capability to good use, considering the cost to do it. So far the answer is NO. But that's just my own take on it, yours may well be different.