Bosses appreciate people who want to learn. When you make a mistake, admit it. If you're a good worker and you make an honest, well-intentioned mistake, even a mediocre boss will cut you some slack. Apologize and move on. Try to fit the corporate culture.
Companies do things a particular way, usually with good reason.
Don't expect the company to change just because you think it should. Unless you're under a tight deadline, don't walk into the boss' office each time you have a question. Instead, wait until you have three or four, or send a request by e-mail. Follow the chain of command. Bosses hate it if they're out of the loop on a project they should know about.