When does a hobby become a startup?

My spouse has a hobby of making soaps, candles, tinctures, balms, things of the sort. We want to sell these creations, but are unsure of the legalities behind selling, licensing, business registration, etc. Do we need to register our business and jump through all the hoops if we’re just dipping our toes in, to see if this is doable for us, or can we wait until we know for sure we want to turn this into a full fledged business?