It's okay, don't tell anyone, but I don't really do much in the way of a flush myself. I am heavy on the organics and use that to my advantage- I feel that it helps avoid that un-flushed chemically harshness.
The first run with a new strain is about practice anyway. Even if you don't know the name, just note down how it behaved in different life stages- like, how much stretch in flower, did it like to be topped in veg, etc... the second grow is always easier to time.