Good luck, that sounds like a really great opportunity to try something new!

I would try not to worry about being unprepared. The program is set up to help you try things out and explore what you might want to do. Your journal is a great idea. One of my friends has been working with a program like that on and off for a few years. He's in school now and his classes are all paid for - and I don't think he even has decided what he wants to do for sure. He's tried out a few different things and actually got a part time job completely outside the program.