Questions:
1. What rides are better first thing vs fastpass?
Definitely go to Fantasyland in the morning as FP do not exist. If Peter Pan is open, go there first
if you can be on within 15 minutes. Otherwise I'd go to Alice first. However, if the kid is afraid of the dark you may want to start with outdoor rides like Dumbo and Casey Junior.
2. What's best/least busy time to spend a couple hours in Toon Town?
We like to go when it opens, an hour after regular park opening. If the park opens at 8am, Toon Town should open at 9am. They do a cute little ceremony where Mickey comes out and walks hand in hand with kids back to his house. My daughter got to hold his hand one time. Mickey and Minnie meet right outside their houses first thing in the morning. Later Mickey moves into his Movie Barn where they have photographers.
Roger Rabbit does not have a height requirement, the requirement is that the child can sit independently. So an infant cannot ride, but a 2 y/o can. Gadget's coaster has a requirement of 35". Some 2 y/o meet this requirement before their third birthday, so just be aware of your child's height. My daughter LOVED this at 2.5 and 3, she still does enjoy it.
3. Is there a best/worst time for the princesses at Fantasy Faire or Elsa/Anna.
I would go to the princesses earlier in the day. Last summer we went first thing one morning and there was no wait. Anna and Elsa have FP, just get them sometime within the first few hours of opening to be sure they don't run out.
4. Which park should we use for our early entry?
If you're not staying on site, you can only use your early entry (called Magic Morning) at
Disneyland. Typically it's Tuesday, Thursday, and Saturday. That is a good day to do Fantasyland (only Fantasyland and Tomorrowland are open) and then Toon Town as it gives you 2 hours in Fantasyland and then you can scoot over to Toon Town and be one of the first there.