You don't need a travel agent. DL is easy compared to WDW. You can find everything you need to know on these boards. Dining reservations open up 60 days before your trip. Being a WDW vet, before you could book online, I used to call right at that 60 day mark. They used to laugh at me and know instantly (or probably the computer told them) that I was a WDW vet. Just book your reservations at 60 days (or wait until the last day of your trip is 60 days out and book them all) to be safe and then you can play around with them later. Dining really doesn't book up as fast; and aside from the most popular places there are typically openings somewhere decent the day of; and CS in our opinion is much better at DLR than it is at WDW. Being of the WDW mindset- I still book right at 60 days and I get online every day to book the day that is 60 days out instead of waiting a few days and booking everything at once. Total overkill, but it makes me less nervous- I don't do it right when the window opens- I just do it at some point that day and occasionally I even forget- "gasp"- and do a couple of days the next day.
For hotel discounts, it is just like WDW, where you can click on places to stay and then on "view offers and discounts". You can also keep an eye on these boards because someone will typically post when they come out. They are generally not as good as what you can find at WDW. It is not unusual for us to spend the same amount for 4 nights at DLR (resort and tickets) as we do for 7 or 8 nights deluxe at WDW.
Once you get started it is not overwhelming at all. We love DLR in part because it is so simple and low stress to plan a trip as opposed to what WDW has turned into since FP+.
As a WDW vet-one tip is to get hoppers. DLR is like one big park- it is 5 minutes to get out of DL and into CA and you don't have to even go through bag check to hop between parks. Also, in the fall the fireworks and shows do not always run every day- so you need to keep an eye on the schedule. Fireworks often only run on weekends after the summer season is over. If you are looking for a splurge- the World of Color Dessert Package is pretty great-- WOC is standing only- but if you do the dessert package you get a table with CHAIRS, food, drink and a decent view. We thought it was money well spent. Have fun!!!