Hair somewhat like Heath Ledger?

Thick is a good thing for that style. If it's pin straight you'll probably need to have a hair dresser give you a wavy perm. I wouldn';t suggest doing it on your own because if you mess it up you'll be sporting a vin diesel instead of a heath ledger. LOL. Seriously, it's a pretty simple style and if you go to a good hair dresser, they can fix you up without spending too much money. Just make sure they know what they're doing or you'll have it too curly.