This is very exciting! I'm so glad you're going to start getting into art with us!
-For shaky hands--this depends on why it's shaking? Some people do have a medical condition where their hands shake--it's pretty common. I have a friend who is a fine art realist painter, and she still manages, but by having a very long brush to correct the shake. In digital programs we simulate having a long brush by applying smoothing that you can put on brush strokes (just look up smoothing for whatever program you are using) I don't have a medical reason for shaking but sometimes I do because I either had a chocolate cake and a kick of caffiene from that or if I'm lower on sugar because I have a meal coming up--so a great trick is to sloooooowly breath out as you draw the line, as if you are doing Yoga. I don't know if you ever wear makeup, but if you ever put on mascara or see someone else putting on mascara or eye liner, they leave often their mouth partly open because it steadies their hands.
-Keep a sketchbook, draw in it whenever you are bored. I have about 30-40 sketchbooks under my belt and that is the core of where I learned to draw. I drew from life-- sneakily drawing other people sitting in the office, other people at the food court, other people at a library (wear sunglasses and no one will know. I'm a girl so it's way less creepy) draw buildings in your city, draw cars, draw your friends, draw your hands, draw shoes (draw SO MANY SHOES) and copy the work from artists that you admire (just make sure to mark who it is your copying somewhere on your sketchbook page so people know that wasn't you that invented that.) Your sketchbook is yours and yours alone. It's freakin awesome and it's where I do almost all of my worldbuilding before I write.
-here's some books you can buy for fairly cheap or can rent from your local library -- James Gurney "Color and Light: A guide for the realist painter." It's really great for learning how color theory works. It doesn't really have assignments in it so you'll have to make your own, but it's just an incredible recourse and it has a ton of dinosaurs in it. ALSO he goes into depth about how a lot of what we learned about color theory in school was in fact incorrect so I really think every artist should give this book a looksie.
--Scott Robertson "How to Draw : Drawing and Sketching Objects and Environments from your Imagination" This is a VERY intense book about how to draw in perspective. It is AMAZING. It's also a lot to take in, but if you do it step by step, you will learn so much. I've been doing art professionally for a while now, and I got this book in January, just finished doing assignments I gave myself for each lesson in this book and I learned just so much, and that's as someone who already thought they knew perspective. This book is bomb. It will make you feel like you can make robots like Evangelion. It's so good.
--"Understanding Comics" by Scott McCloud - This book is a comic book about how to understand comic books. I didn't really grow up reading a whole ton of comics, so for me this was really, really wonderful for laying out in a very scientific and practical way how comics make your reader feel and understand. It's really just--a great book.
--Also, something that I think is super important because it's very easy to compare yourself on the internet to other people--always make sure to find something you like about every piece you do. It's really easy to pick out imperfections, but a lot of artists really struggle to compliment themselves, even a little--but it's those compliments that will keep you drawing 10 years down the road. I hope you really love what you do!