If your teacher is any good it won't really matter what you say. There are many more aspects to learning than what you play. It's how you sit, how you move, your attitude and motivation toward learning, the style you want to play the most, the music you enjoy personally and where you want to go.
Crucially, you need to meet a teacher as a blank slate. Don't worry about the bad habits you may have picked up as a self learner - these can either be A: ironed out by good practice and support from teach or B: used to your advantage. I'd imagine that some of the greatest pieces we hear have come from those little things that make each player their own player.
Pick a selection of pieces (and these do not have to be 'classical' piano pieces, if you want to learn how to play a rock tune or 'music off an advert' then that's cool), maybe three or four, and go armed. Just say 'teach me this'. If they say 'NO!!! It must be BACH!!!' Then get another teacher. If they say 'okay, but we'll need to get the fundementals going, here's some Bach that uses the same technique' - you're good to go.
ONLY IN MY OPNION ARE THE VIEWS ABOVE VALID
Topic: Starting piano