Kits for pieced kits usually give yardage, and you cut your pieces. I have found that the kit makers are generous with the fabric, and I always have fabric left over, but I am (or try to be) a precision cutter. I usually measure 3 times (not twice) before cutting. Many kits now are taking advantage of precuts (jelly rolls, layer cakes, etc.), so there is less cutting. You just have to read the descriptions carefully.
Applique kits are being marketed in two ways - needleturn and fusible. The needleturn kits have swatches of fabric which you use with your preferred applique method (freezer paper, template & starch, back basting, etc.). Most of the fusible kits are laser cut with the fusible already applied.
If you have any questions, contact the seller before making the purchase.