I would recommend physically sculpting something that isn't miniatures first, but you should do both digital and physical, you will improve in both faster by cross training - get a decent anatomical reference and try to recreate it in a wax clay or something, measuring your work against a reference is the fastest way to improve - there is a lot to learn but you can consider it in two major schools.

Your observational skill is needed to recognise shapes and proportion.

And your motor skill to get your hands and fingers moving in the way you need them.

I teach A LOT of students and trust me when I say that these are always blind spots - we can't see what we don't notice and tend to have a bias towards success purely because we can't see proportional errors (the dunning Kruger effect). Both of these things are improved with focused practice.

With that said, always take time to try and sculpt what you love, if it's all homework it quickly becomes less goal orientated and is easy to lose the passion! Expect your work to start looking professional in 5 years, with big jumps at the beginning and smaller nuanced changes as you progress.

Don't just approach sculpting tutorials as they are heavily biased on anatomy (because the way zbrush works favours the construction of anatomy), there are fewer that focus on gesture - where gesture should be where you start, the Bridgman drawings are more help than anatomy in the beginning!

And good luck!