When I first started serious quilting I didn't have a clue. First thing is a rotary cutter. Get one that feels good. (reminder always keep a sharp blade on it). Second good cutting mat. If you can only afford a single ruler get the ruler that feels the best in you hands that you can manage. I started with a 12" x 6" ruler only because I couldn't manage the 24" x 6". However you may get more bang for you buck with the 24" x 6" ruler. The other thing that I can't emphasize enough it a good iron! Every piece you make, every block you do with need to be made square and between your ruler and iron they create success! As so many have said there are so many good tutorial out there.
Also make good use of the block library here. They are clearly marked for the level of skill. I want to here how these quilts come out. Send pictures! Happy quilting!