I think all fabrics now are folded with the right side out so if it hasn't been washed, the right side is probably on the outside. If you have older fabric the right side may be on the inside of the fold. I remember when I was much younger, the right side was inside then one side was turned up and over the bolt so you could easily see what the fabric looked like. To see the price, we had to look under the fabric.
In any case, just make sure you keep it all with the same side up (mark it to make it easier).