Watch movies, look at the works of great painters and develop artistic vision. Don’t worry so much about what camera or what lens or the other technical stuff, it will come if the passion is there and vision is clear. Conrad Hall once asked an assistant to get him a certain lens and the assistant came back proudly with another lens that he thought was better. He explained to Conrad that it was a better lens and would produce a better image. Conrad didn’t use it of course and didn’t want the “better” image. He wanted the lens he wanted for a reason. It’s what the artists wants to accomplish. If you have the vision and the passion to follow through the tools will be found to make what you imagine. Learn to use your imagination. That is the most important tool any great Cinematographer or artist of any salt has. Without it all the tools and technical know how is not worth a great deal.