I've attached the blind structure for a tourney I ran a while ago. I used 5 chip values; 50,100,500,1000 and 5000 and would suggest you start with 4000 worth per player, giving 200k in total. I'd use 20 mins levels to start, but you can always change to 15 mins if you get tight for time. If nothing else, it gives you an idea where to start.