When I started out, all my labels were hand-written. Keeping it neat and legible was the challenge, as when my hand tires, my writing gets sloppy. That's why I eventually moved to printed labels for my soaps. But I stuck with hand written labels for about 2 years, I think, maybe 3.
I determined size of labels, cut a template so I would know how much space I had for writing and then do a practice label and see how it fit. After a couple of trial and error runs, I was able to do my hand-written labels pretty well without much waste. I still have some of those soaps.
The front was the name of the soap and the weight; the back was the ingredient of the soap. I put the made-on date where ever it would fit (front, side or back, as needed).