Thanks!
I also started with Paint ^^
I don't know much about Photoshop, but I know a lot of people use that for art, so maybe you should try and use that as well (although like I said, I know nothing about it, so it may be harder than Clip Studio/Manga Studio).
Something that really helped me out when I first started digital art was the tutorials on Pixiv Spotlight - a subsection of Pixiv, a Japanese art site, kinda like their DeviantArt.
Pixiv Spotlight itself is translated into English, but a lot of the tutorials are in Japanese; oddly enough, this doesn't really matter. You can pretty much tell what's going on anyway. They have regular art tutorials and ones specifically for coloring digitally, and they helped me a lot with coloring XD
The art style on Pixiv is, being a Japanese website, more anime/manga like, but of course almost all of the tutorials can be used for other styles as well. They also have some color palettes, which is an AWESOME help when starting out digital art.
Something else I should mention is that Clip Studio is VERY customizable.
If you go to the 'window' tab, you can check and uncheck everything you want to be visible. It's a little confusing at first, because I remember when I started I wasn't sure what everything did, so I didn't know if I wanted to see it or not, but honestly, everything can be checked again once you uncheck it, so if it's in your way and you don't know what it is, just get rid of it for now.
The color palette, which is probable the MOST IMPORTANT part of any art program, is also customizable.
Right above it there are little tabs, and by clicking them you can change what type of color wheel/palette you're using. You can also move it all around to any corner you want, by click-and-drag.
You also need to familiarize yourself to what the icons on the left do; they're super important. I'm sure you've already realized that the brush icon takes you to brushes, as the pencil icon takes you to pencils, but the slightly more confusing icons are super important too, like the blend icon (2 raindops fusing together), and the select icon (a rectangle made with a dotted line).
Another thing that helped me start out with Clip Studio was watching speedpaints online; speedpaints aren't really made to be informative, but they sorta teach you the very basics if you don't know, like color the skin first, and how to shade, and how colors can be changed after you draw them.. I make speedpaints in Clip Studio, and there's tons of other awesome ones too.