You do not need to keep track of your customers. You do write out a receipt at a craft show don't you?
You are not making durable goods eg Baby cribs and the like so you do not have to have a customer registry.
The tracking label is for the customer to identify the seller.
And you don't really need a batch unless you are making bunches of stuff. For example I generally only make 1-2 of an item. Maybe 5-6 at the max. I'm using all the same fabric, buttons, etc. Nothing has changed. But lets say you make 100 identical red bows. All you supplies are purchased at the same time, and the clips you are using are from the same order. Now a month later you get another order for 50 of the same red bows. You have to go buy all new supplies including hair clips. Guess what, you need a batch number, because you have changed supplies. especially the hair clips that you may have bought from a different vendor. Did you get a certificate for the clips? Cause you need one. Because you have made a material change in the supplies. Your first batch could be A, and your second batch could be B. So depending on what you are making , you may need batches.