This is my basting method. I've never seen anyone do it exactly like me and my method may not work for you. I do a lot of free motion quilting and the occasional light straight line quilting and I don't get puckers. This works for me, but it may not work for you. Take what you like from my method and leave what you don't...that's how I came up with this method in the first place!
Now turn your quilt over and start basting the top. If your backing/front is directional, make sure you get it right (guess what, I didn't...I repositioned and forgot to check that everything was going the right direction). I lay the batting side up and then lay my quilt top on my batting. I roll back my quilt top like a sardine can lid then spray my batting. After the batting is tacky, I slowly unroll the quilt top, pressing with my hands and then with my iron.
Because I use heat in my basting method, I never mark my quilt top before basting. Doing so could make your disappearing ink set permanently.
Next up: Quilting your quilt sandwich!!