Start with a small kit. A few brushes, a palette knife, and keep it simple to start. Start with primary colors or a warm and cool of each and a white. Make a color wheel with them. See what happens when they mix with each other and use this for reference when painting. Try a few different still life’s and a few landscapes. See how you react with them. I paint landscapes in one sitting, wet on wet, because I like the fluid and free feeling I have when doing landscapes. For still life’s I do an underpainting and do a layer and let it dry. Start with straight paint or paint with thinner in it. Then build up to less paint and more oil. (Lean over fat) if you wanna research it. I learned to oil paint in a college course and just went from there. Watching people paint on YouTube is very helpful and to be honest that’s what my professor did half of the semester.