Don't try to call florists to get every detail concerning prices and creative ideas on the phone. Planning floral decorations for a wedding requires time and effort. Plan to go in to see the florist. It's not unusual for a bridal consultation to last at least one hour, often longer. Set up an appointment at a mutually convenient time.
Some florists charge extra for the consultation.
Some may not charge anything for the consult. There is no one set practice in the floral field. Just as other professionals charge for their time, so too can the florist. Treat the florist with respect. If you are only pricing, say so.