first..welcome!
secondly, we have ALL been there...you need to make a practice sandwich using the same fabric and batting so you can adjust your tension to do the quilting. Also make sure you are using a NEW sharp needle and thread that is meant to be used for quilting both on top and in the bobbin.
More than likely it is just a tension issue and you will need to make notes on your sandwich or a sticky note as to what # your tension dial was on and what stitch length/width you were using!
Good luck and keep us posted