You might already know this, but you'll want to use a ruler foot with those rulers. It's a foot where the toe is "taller" than standard. It's to prevent the ruler from slipping on top of the foot and getting between the foot and the needle, which can break a needle and knock the machine out of timing. Hopefully the machine came with one since it came with the rulers.
Handi Quilter has some good videos on ruler quilting. They're obviously intended to market their rulers, but they do show techniques.
Even though it means more frequent starts and stops, I prefer shorter/smaller rulers to larger ones, including for straight-line quilting.