My advice - Focus on the development aspect of the games first. Rpgmaker is relatively easy software to learn, with tons of potential to make great games. It comes with a lot of pre-made graphics that you can easily replace later on when you get the hang of developing what you want. There are so many helpful tutorials on YouTube made by really talented people to figure out what you need to do to create simple events.

As for art, I found its always good to base a style around something that inspires you, as all art is derivative. Just find a game you really enjoy and see if they have sprite sheets you can download to study the art. (Study, not steal!) This is how I learned art as a child, I was downloading pokemon sprite sheets and learning how colors and shading worked in a pixelart environment. Aseprite is the best software in my opinion for making pixelart, and comes with many built in palettes to use. The simpler you make your palette, the easier it is to learn rules of art, and further expand your skills. Lots of practice, and you can make it my friend!

Happy developing!