John, welcome back to the hobby. Like you it has been a few decades for me also.
I been at this for 5 years now and I never heard of rust green or pink earth nor shadow burnt sienna, but I heard and own the color "burnt sienna". Nor have I ever heard mapping unless that is another name for weathering.
There a alot of paint brands out there along with washes, filters, pigments and effects. I suggest you go to you-tube to learn about all of the products out there and how they are applied and used to get the effect you are looking for.
I used Tamiya, Vallejo, MIG, AK, Mission, White Ensign, Humbol paints, and sometimes primer I picked up at the auto parts store. A lot of modelers just go to their local art store and purchase pigments, oil and acrylic paint in tubes and thin them down to make their own washes, filters, etc..
I suggest you start with a Tamiya AFV kit, follow their coloring instructions. If you want the AFV to look weathered instead of new out of the factory then this is where you add washes, pin washes, filters, dot filters, pigments etc.. This is where You-Tube comes in handy. I didn't have a clue about any of it until I started watching other modelers assemble, paint and weather their AFV. After a couple of hundred hours of videos, and numerous AFV and ships I think I am getting the hang of it, but I still watching new videos every week looking for a new item, paint, glue or proceedures that will make me a better modeler.
Start small and go slowly and try something new with each build. Before you know it you will be impressing yourself with what you just did. Most important is to enjoy the build, you will run into problems, and make the stupidest errors, we all do. Use the forums, everybody here wants to help and have the experience.
See you around.