>>4167535
Get a limited palette. Start underpainting in raw umber and sienna. Learn to mix colors using primaries red blue yellow, or cyan, magenta, yellow (if you want to go that way). There are some good videos about it on youtube, if you just search. Remember to thin your paints with mediums and gamsol solvents, those are a must. I find oil painting the best medium possible, not that they aren't time-consuming, but they just look so vivid and rich. The downsides for me are cleaning up. Making sure to clean the brushes because it's not as simple as washing them in water and also the mess, get in the habit of wearing nitrile gloves when you work as some of the pigments are toxic. That being said, acrylics are bad for the environment and you aren't supposed to wash them down the drain as they are plastics. You should use solvents and soap and water as well to clean your brushes.
To be honest, I started using watered down acrylics instead of watercolor because they don't get muddy like watercolor and you can layer them, but oils are certainly something I'd like to get back into. I've only painted one half-way decent oil painting ever and it took me over a year. Still you'll love oils implying you have the drawing skills to provide structure behind them.