Practice your free-motion on a panel or charity quilt.
You will enjoy getting back into quilting again if you don't put pressure on yourself as you machine quilt. One way to free-motion a larger quilt is to divide it into 4 sections with a plus sign. Start in the middle of the quilt in each section and quilt your design, always keeping the bulk of the quilt to your left. I can not remember where I read about this method. Maybe others on the board can chime in with a link or tutorial.
Another tip is to use a panel to practice free-motion quilting. You may not be timid and more relaxed knowing you aren't quilting over your pieced blocks that you have invested alot of time and $. Lastly, if you do a charity quilt, you will be giving it away and you won't keep going back to your beginner mistakes that others will never notice.
Good luck and welcome back to the quilting world!