Okay, here's your introduction to Business Planning.
Some business plans can be very complicated and involve a lot of deep thought. But they don't have to start that way. In fact, I think you should be able to say as much as anyone needs to know about your business in just a couple of sentences. (That is, more than "flower business", but to say something about your suppliers, your production, your marketing, your customers and your plans for growth - and a little bit about risk, too.)
So let's get started.
First you should have a pretty good idea of "the market". That means the people you plan to sell to, obviously, but it also includes the people that you expect to buy from, and the things you need to buy. By "the market" I mean (in terms of flowers, anyway) what are the popular products and what do they sell for? What will it take to create "that product" and can you make money at it?
But we're getting ahead of ourselves. Because you also need to look at "cost of production". What will it take you to create space and conditions to grow the flowers? How long will it take? (Can you grow all year long in Thailand? You don't have to worry about a cold winter, so I'm wondering about that.)
What kind of equipment will you need to grow? Pots? Cans? Wooden boxes? How much can you get for free, and how much can you use more than one time? What about soil? Can you get that for free? (And if soil is free, is it safe from pests and mold and such?) Fertilizer cost? Water? Do you need to protect the flowers from the sun, the rain, birds, insects and people who would steal them? That's more equipment and building cost, and maybe more space. Estimate the costs as well as you can. Plan on extra cost for things that you forgot.
Then there's time, too. How long will it take to grow a crop of flowers? How much of your time will it take every day to tend them, to weed them, and to start new flower seedlings from the ones that you lose to sales or other causes. (Because you will lose some flowers that you can't sell, too, so you have to consider that your sales will not be everything you set out to grow.) So figure a "breakage or loss rate" that's going to limit what you can sell.
More costs: How much will it cost you to advertise or find customers? What about your costs of transporting goods to market, or the costs of acquiring your equipment? Do you need to rent space in a market stall? Do you need insurance? Cost for disposal of waste?
Selling: The hard part for a lot of people is making the personal contacts and then closing sales. But this may be one place where your experience could help you. You have always had to be friendly, maybe even when you didn't really want to be. So you can make people feel comfortable and you can approach people to make the sales. See how other flower vendors make sales, and then see if there are places and ways that you can sell that they haven't. Hotels? Restaurants? Street food vendors? Door-to-door? (I'm just guessing; this is a market that I know nothing about.) This is one place where you will have to be creative: find ways to make new sales channels that no one else has discovered before. For example, you know how they give tourists in Hawai'i flower leis? What if you could hook up with a travel agent who could make that a thing in Thailand? You could make flower leis that someone else could present to tourists and make that "a thing". (That's just my own wild idea. You know Thailand; you could come up with something better.)
Finally, you need to make a profit, obviously. You need to consider your own wages - so think about what you need to make every month, and then look at your numbers very coldly and consider: Can I make that much money? How to I cut costs, improve sales or sell for higher margins (more money) in order to make that happen? You can't try to fool yourself, because the numbers will not lie.
The whole thing is to have a plan that you can start to follow. It will change as you get more experience, and that's the way it should happen. But having the plan will let you see clearly: Am I doing better than the plan? (Yay!) Or am I doing worse than the plan? (Uh - oh. Need to change things!) So the plan has to at least be logically workable first.
Okay. That's a lot of words, but here's where you need to start:
List equipment and estimated costs.
List materials that go into the flowers, and their estimated costs.
List flower seedling costs, if you'll start from seedlings.
Be sure that you have included everything you think it will take to "make" the business.
Now list the prices that you think you can sell for. Be realistic! You have to know your market: your competitors.
Subtract the costs of getting products to market.
Subtract the cost of lost goods: goods that don't sell, those that get damaged before they get to market, replacement items that you give to customers who complain about bad products. Again, don't try to pretend that these costs don't exist!
Consider your own wages. You need to make money at this!
Now do the arithmetic. Can the business work? What needs to change in order to make it work?
Start to put the plan together, and let's talk about it some more. Email like this is better than Facebook chat for complicated subjects.