One thing I always stress is that the base of the foundation is so important for the likes of scarring. Make sure you get a good primer. It can make a huge difference. I'd recommend No.7 Airbrush away or Benefit Porefessional. They're pricey but they're GREAT for very uneven skin. Or Mac prep and Prime Skin Smoother, which I'm not personally keen on but other MUAs I know swear by it.
For foundations I wouldn't recommend anything too dewy as they can highlight uneven skin. Any bumps on the skin and the light just reflects off it. What's your skin like? Is it oily, dry etc.
One of my favourites just now is 'Nars Sheer Matte' The other being good old Makeup Forever, Mat Velvet.
Failing all thos, Double wear will rarely let you down.
I think the best thing you can really do is go into somewhere like Jenners and try a few.