I agree that as a beginner you should forget about flat basing as you will catch a nasty edge.
However as you get better flat basing can actually be used to gain speed for flat run outs. I do it all the time, I can get a lot more speed by not putting an edge into the snow.
I was trying not to over complicate thing for him!
I'm the king of making it through the flats... Depending on the snow though it's sometimes faster to be up on an edge a little anyway!