For me, I would not plan out an itinerary; I find those rather stressful at DL. I would just decide which rides you want to do and then "go with the flow". Keep an eye on the wait times boards for the big rides and do whichever ones have a short(ish) line. Use FP when possible. If you can, try to get there at rope drop because the mornings tend to the quietest (in terms of crowds). Take naps or breaks when needed.
Another common suggestion is that if you are not participating in the EMH/MM, avoid that park that morning. This is especially true if you want to ride RSR or TSMM (in DCA) or Peter Pan or see A&E (in DL). If you go to DCA on a non-EMH morning, there are generally two plans of attack. Either head straight to RSR and ride it or head straight to TSMM and ride that. I like the option that heads straight to TSMM (it might be possible to get in a few rides) and then head back to get a RSR FP (assuming your child is tall enough and you want to ride RSR). For DL, the advice is to go on a non-EMH/MM so you have the best chance at a reasonable line for A&E. Peter Pan is a popular option if you are not interested in A&E. If you do plan to see A&E, then you have to be there pre-rope drop and at the front of the line if you want to avoid the hours long wait.
Ultimately, have fun!