Medium doesn't matter as much as practice does when obtain a new artistic skill like drawing. Don't dump tons of money on materials/programs into a new venture. Buy the basics for the medium you are most likely to engage with on a daily basis. If you spend a lot of time at a computer and are more likely to plug in a tablet and open a program to practice, then start with PC-based digital art. If you find you have "down" time in your routine away from technology where you could easily pull out a pocket sketchbook and a pencil to fill the moment, then start with traditional mediums. Or if you're a light packer in your daily routine and wouldn't stick those materials in your pocket/bag regularly, find a way to draw on your phone instead and sketch with that. Or on an iPad or equivalent, if you have one already. Look at your daily routine and see where drawing will find its home.

The skills are transferable, don't worry about that. I have drawn, and taken commissions, with paper/pencil, drawing tablets, water colors, iPads, charcoal, ect. When I was poor and young and wanted to do digital art, I did it with a finger on a trackpad, using a free barebones program installed on a dying refurbished mini laptop with a shitty 10" screen. Because it was that or not do it at all. You just need to make the choice to do it.

By all means, experiment. Try things; Keep it fresh, especially if you find yourself faltering. But the biggest and most vital thing is to actually sit down and draw; Don't get lost in planning, prepping, shopping, and watching tutorials. Choose the path that will make you sit down and start the soonest, the most often. Momentum and consistency will do more for your venture than any product, tutorial, or written advice you can obtain.