Does anyone here have experience working with PL/SQL? I need some help getting started...

I am taking a class this fall on PL/SQL. The problem is, we have not been told what development tool to use, and I am clueless. Our professor has not provided this information (at least, not yet), and I am raring to go! I like to work through examples as I read the text, but obviously can’t at this point. Any advice?