Flower clubs might help you out. If you can get training or an apprenticeship with a local florist, you can use that to get a qualification (e.g. NVQ) in floristry.
Since you love arranging flowers, half the job is done in becoming a florist. You can enroll in a floral design school. All you need is creativity and customer focus.
The most important thing you have to have in order to become a florist is a love of flowers. If you want to start your own floral company, you need to have the money and the resources to make that happen.
Well you don't really have to do anything except have a great interest in flowers. If you love flowers then that is the perfect job for you. You just have to enjoy flowers.