I am new to quilting also. But I'm not new to sewing. My first quilt I am still hand quilting the top. But first thing I would say is don’t be over critical in the beginning. I have seen some places where my lines are not 100% but close enough that unless you are looking really close you probably won't notice. What pattern are you using? Can you get some scrap fabric cheep and practice the squares to make them line up better? Maybe find some sheets on clearance (even if they don’t match) and get a couple colors and practice the squares. Or maybe get some different color paper and practice that way I’d even sew it on the machine and see what happens. Also many people recommended marking your 1/4" sew line on your machine as a guide. I know that made it easier for me. Good Luck and don't get discouraged.
And my last piece of advice is buying a good seam ripper. Just remember to have fun with it. This is supposed to be relaxing.
Diane