Disney Worlds Noobs-Need Help

My wife and I are going to be going to Disney World in May. It's been years since we've last been there (it was about 30 years ago that I last went), and both of us are noobs when it comes to planning things out and getting reservations. We've already purchased our flights and hotel room (we're staying at Pop Resort), and we've got tickets to go to all four parks.

For those who are more experienced, do you have any suggestions or tips on how to go about planning things out, making reservations for the things we want to do, and possibly getting a travel agent to assist us with this? From what I've seen in other threads in this subreddit, it seems like travel agents might be able to assist us. Any suggestions for agents? Will a travel agent cost us money to help us with this stuff?