I want a job at a clothing store but i have no "official" working experience?

i specifically would like a job at Hot Topic because the atmostphere and the type of clothing fits my "personality" but i have no official working experience, this would be my first job. I do however go to a vocational school and i am in a student-run floral shop. I have had to deal with customers on the level of giving them the arrangment/items they want have had to do paper work such as writing up orders, handling money etc. I have also done volunteer work a number of times. Can anyone give me tips/hint or ideas. i just need some feedback.