A few tips if you are able to shop in person for fabric.
1. Can you see through it? You shouldn't be able to. Thin fabric ...ew.
2. Does it stretch much in either direction? It shouldn't stretch from selvage-to-selvage, and shouldn't stretch too much the other direction.
3. How does it feel? If it's soft and drapes nicely in your hand, you will enjoy it as a quilt. If it's coarse or scratchy....nah.
Online shopping is different. You're best off getting just 1/3 or 1/2 of a yard of a fabric
you're not familiar with, until you find out if you like it. If you do, order more right away, because when fabrics are gone, they're gone. Manufacturers produce new lines and phase out the old quite quickly in the quilting industry.