Well is start on wearing combat boots first it's only one pair of shoes but if you're formal all the time then a pair of combat boots will be a good slow transition and here a site that have punk but stylish clothes www.nastygal.com
Hi so I sense you want a change :) Here's a cool shop that sells all black clothing www.MrsBlak.com They have a few interesting boards For hair styles I think short sharp cut fringe would be good to start with. Think Kat Von D