S.N.
We just got back from Disneyworld and universal last week. I planned our trip in two months. I got my hotel thru disney website and our park tickets from Undercover Tourist website. A great informational website is Allears.com. Since it's so last minute you may want to go directly thru Disney so they can send your magic bands right away. You can make reservations for rides before you get there with the Fast pass + system. I really liked it because we stood in very few lines there because of the Fast pass.
We did not do a meal plan and had groceries delivered by Garden Grocer. We ate one meal in the room, sometimes took sandwiches and snacks and also did quick service dining. It's impossible to get reservations at some of the dining places if its just a month away. Luckily, we weren't really interested in character meals. We spent half the money on meals this way vs doing a dining plan.
We stayed at port Orleans French Quarter and really liked it. Nice pool with a small slide. My 8 yr old was happy, it's one of their moderate resorts. The bus systems there are very good and you hardly wait.
Have fun!