TripHip - Travel Tips and Advice for Traveling on a Budget

I am thinking of going to Sydney Australia and would like to know how I can get on to a good scheme where I get air miles when travelling.

I usually pay on my credit card but I could use a debit card. I always pay off my credit card each month so I do not run up any interest charges.

I hear about friends who save up air miles and travel business class and some first class. I would like to do this one day and do not know how to go about it. Please can you advise me of the best way.