Anyone know anything about flintknapping?

Found what I would describe as a flint dart point or knife on the family farm. It is approximately 3½” long, 2 1/8” wide toward the base and about ¾” thick at the thickest point and does not appear to be of very high quality with the flakes removed in large chunks with little or no fine pressure flaking on the edges.

How do you, or can you, tell a crudely made point from a rough cut blank that you will eventually make something good out of?

One item to note, this is from an area of blackland farmland. The available stone material are chert nodules in the soils; probably originating in the deeper chalk layer below the topsoils.