If the rest of the video is 24p then go for that, the same if it's 30p. If there is no "rest of the video", and planning to go only on the web then 24 will give you a more filmic feel. Your audio setup is ok, just remember if you record directly to the camera the sound will not be very good, try to get an external recorder if possible. If you can have separate channels for the shotgun and the lavs you will have greater flexibility in post, and if one of your mics stop working for some reason you will have another clean source in the other channel. That can save your day.