My friend and I have just started doing Ballroom and Latin American dancing (once a week) and love it! We are looking into buying Ballroom dancing shoes. We are teenagers, and lets hypothetically say that our feet aren't going to grow any bigger (so we wont outgrow the shoes). The questions are:

1. How many pairs of shoes am I going to need at one time?
2. Can I use the same pair for Ballroom dancing and Latin American Dancing? I like the Latin American pair better, so could I use a Latin American pair for Ballroom as well?
3. How much do they cost (please say what currency you are using) - what price range is worth the cost?
4. How long would they last? (referring to the above question).
5. When do you recommend that a beginner should get shoes? E.g. after how many lessons?


Thank you for all of the help