@sheridanhoughton I have a lot of flower shops. They're my favourite things to sell. They make a huge profit too. The most important things to know are you must make them Timeless or you'll have a store full of buzzing flies and dead flowers. It's difficult to find which one it is too if you miss one. You just hear buzzzzzz and have to look everywhere. Also if you save the store to the gallery the arrangements don't save properly. Luckily another player warned me about that. They turn into pretty stalks. But, it doesn't affect Wedding Bouquets if you have Wedding Stories. You can copy those easily to save time by making a few, saving the room and then placing it again. But just not the full flower arrangements. I add a little wedding bouquet shelf to a lot of my retail lots this way.
If you have a Spellcaster you can use Copypasto to copy flower arrangements, but you can't restock those manually like other stock. You get a little ash pile. But bearing that in mind it's still a quick way to add flowers to a retail lot. You just get them to restock the same way or by making a new one.
I like to add the Nifty Knitting plants too (but frustratingly you can't sell the hanging pots). I add the ceramic llamas and the knitted cacti.
All my Sims head to the florist after moving in, but again those flower arrangements won't look the same if the lot is added to the gallery.
I always put a little apartment upstairs as it takes a long time to stock the shop one arrangement at a time. So my Sims will live there a lot of the time. One Sim has 2 florist shops. I also add the little flower stall from Wedding Stories to the car park so my Sims can buy flowers individually and get the Bluebells needed to make them Timeless.