For two days and young kids here's what I'd do.
Sunday when you enter do NOT go to Fantasyland because there will already be lines for rides. Also do NOT go to Nemo as that line builds VERY quickly in the first 10 min of EE. Head to the left side of the park (Jungle Cruise, Pirates, Haunted Mansion, Winnie-the-Pooh, Pirate's Lair.
Monday when everyone enters at the same time, this is the time to hit the Fantasyland rides. Just a note that a few dark rides are very scary and the darkness doesn't help younger kids either. Snow White (especially), Mr. Toad, and Pinocchio are all have some intense scenes, so just be careful. Peter Pan and Alice should be fine.
If Nemo is a big priority, try in the early evening around dinner or parade times.