Everything here has been good advice.. now let me give you a few terms..
Selvage, is the woven edge of the fabric.
Bias, if you open the piece of fabric out flat and pull from top right corner to bottom left corner you'll see it stretch and make a row of ripples.. that is bias.
Straight grain refers to the woven threads.. there is a grain the length of the fabric and one the width.. the width one stretches just a wee bit.. that's why some refer to the lengthwise grain as the "straight grain".
Standard seam allowance for quilting is a 1/4".. or some say a scant 1/4".. your choice. Just be consistent. When sewing garments the standard seam allowance is 5/8".
If you have further questions don't hesitate to ask.. we love to help! Happy stitching!!