Does the landlord want to open a shop or is it just a hobby? If you want to open a shop, I suggest you find some free flower arranging courses online and start with zero-based learning. If you are more and more interested in this period, you can consider signing up for an offline training institution.

But I really suggest that you start learning for free first, and then go further if you are interested, otherwise it will be a waste of money to sign up for an interest class at once.

There are quite a few free online floral teaching courses, such as Floriculture College and Times, which are not bad.