Making a Karaoke dvd with Keynote

someone wants this so I will add the song then put lyrics on several pages then auto record the page flips

Q: to print this to a final dvd

1 - WHAT IS THE OPTIMAL SCREEN RESOLUTION FOR A NICE EASY TO READ DVD TO PLAY ON XXX TV SCREEN?

THIS FOR THE KEYNOTE PAGES FORMAT...

800x600?

1024x 768?

1280x720?

or?

2 - WHAT IS THE BEST FONT SIZE TO USE FOR EASY READING ON THE DVD / TV SCREEN?