The fact that you're a beginner doesn't come in to it, you want to get the best you can afford. Photoshop and Illustrator are the go-to ones for professionals,
if you have access to them. Otherwise, Affinity is supposed to be good and very affordable. Just search for 'best digital drawing/art software/app' - some are even free.
It really depends on what you are wanting to draw or illustrate, but you will almost definitely need some kind of pen tablet such as a Wacom if you're working on a computer.
Again, get the best that you can afford. There's lots of advice online and thousands of tutorials, but don't forget to keep drawing with pen and paper too!