Carol,
Lots of great techniques out there. When I'm doing straight lines I use blue painter's tape. (avoid masking tape...leaves a residue). For designs ,I use Golden Threads Quilting paper. It's easy to remove. I just copy the design on to the paper and pin it in place on the quilt top. Stitch right on top and then tear away. I've always tried to avoid using marking tools. I'm deathly afraid they marks will set and be permanent.