meandering usually means- no marking necessary- you simply ... meander along
you might want to mark some guide-lines to help keep your quilting balanced over the quilt- if you want a specific (design) you certainly could use stensils, or patterns- in my mind that takes you away from 'meandering' into a designed quilting plan
the batting you choose will specify how much quilting you have to do- some batts require quilting every 2" (which is quite dense) others allow up to 10" between stitching lines- it is important for a positive outcome to follow the recommendations on the batting