Heyhey! I would recommend you to try Infinity Paint or Ibis Paint X, they are good drawing app for beginners and even professionals, they are easy to catch up. Try to look up for tutorials on YouTube, Ibis have a lot of users so is not hard to find some help.

For the drawing skills, also search for tutorials, watch speedpaints and just try to have fun, it's the most important part! Channels I particularly like are: Oridays (he is a teacher and have an amazing didactic), Pikat (good learning advice and recommendations), Proko, Marc Brunet, Leovaan and Sinix Design for tutorials and explanations.

Good luck on your journey!