your batting is the first 'clue' to the density of your quilting...read the package. if you are using warm & natural or one of the dream batts that allow you to have up to 10" between quilting you could with that in mind figure out a design with large stipples, swirls...
if the package says you need to quilt every 2-4" then dense/concentrated quilting is needed.
after you determine the amount of quilting is required then start with paper and pencil and start drawing your design using the spacing required. when you have a design you like that works on your quilt then start again. a plan in advance really helps. and knowing your batting properties is really a necessary tid-bit of information