If there is one skill you should focus on above all else its refactoring. With that in mind, just start and expect to rewrite as you learn. As for specific too

If there is one skill you should focus on above all else its refactoring. With that in mind, just start and expect to rewrite as you learn. As for specific tools, I too only recently picked up a mac and while it was a bit painful at the start there is plenty of instructions out there for getting your environment set up. Good luck!