Before you start buying rulers check to see which ones are easiest for YOU to read by laying them on several colors of fabric. I started with some Olfa yellow rulers but had a hard time seeing the mark. Then I found the Nifty Notions Rulers by Kay England that ate pink and teal. The quarter marks are 1 color and the halves are the other. They worked much better for me.
I also like the TruCut Rulers with a similar color scheme. They have a ridge their special rotary cutter rides on so you don't have to worry about accurate cutting because the cutter is riding on the ruler. You can get their nonslip disks to stick on the underside of the ruler to help hold them in place while cutting.
Your going to love your adventure in quilting.