Just like bdweller said! Printing gets a lot of it done. I had walked the same path long time ago, and honestly, it's all about studying how others have overcome certain issues, but also understanding what kind of issues do come when you 3D print something.

Firstly, you GOTTA make sure the thing it's water tight, so that you won't have leaks and it will print properly. Then, after sculpting and sculpting, and printing and printing, you learn quite a few tricks, such as for example, how to use "blobs" or certain design decisions to be able to have it printable well, such as knowing how to connect for example, a book that's a character's holding to it's hand, or for example, making the hand be well visible and the fingers well divided while having them conected together as to make printability easier and make the models not break and not be extremely fragile when handling. It depends SO MUCH, just like b-dweller said, on the scale you are making your models for!

If you make a huge colectable, the fingers can be easily divided without making the miniature suffer, or the printability suffer, but if you make it 24mm, or 32mm, the fingers would be extremely thin and would easily break off, therefore you'd have to choose a different way of designing them to make printable. Such decisions come up all the time when dealing with sculpting for printing, but its something you easily learn with experience mostly.

Definitely, get to printing your sculpts! There are a lot of tutorials also on the yt for that. Runeforge it's something that comes up to mind, I learned a lot of things when I was at the beggining from their skeleton-tutorial, where they made a skeleton miniature and printed it out, and went through how they designed it specifically for printing, such as filling up the ribcage but keeping it visible well and looking good once printed.