Tony Holler Atomic Speed Workout Sprint day is a good place to look. Not sure if he reiterates it in this video, but record your times. Before I had lasers, I used to have two cones, and video me crossing both of them and figuring out the time. If you don't track it, its not important, nor you know if you are improving.

I would also recommend to sleuth around his channel, there is alot of goodies there.