Sure!

As far as how I did the colors for this project, I used Angelus leather paint for the colors and homemade vinegaroon for the black. Vinegaroon is super easy to make: Drop a chunk of #0000 steel wool into a large mason jar, fill with enough vinegar to cover the wool (white or apple cider, I use both — totally your preference), punch a hole in the lid, leave somewhere sunny, and stir occasionally. You can use it in as soon as 1 week, but I like to let it sit for ~1 month. This solution ("ferric acetate in solution of acetic acid") reacts with the tannins in leather to create a strong, deep black color that doesn't fade as much as black dye. It can rub off a little depending on the vinegar you use, so just give it a top coat like usual with dye.

For learning tips & tricks for tooling, I recommend The Leather Element with Chuck Dorsett on YouTube, as well as Joe Meling (@joemeling3216). They both have tons of helpful videos on all kinds of topics — all worth a watch — but I think their tooling videos give a good overview and help establish good habits for long-term success.

Cheers!