I would think about reservations (at least for weekends) in popular/tourist areas such as the Cape, Bar Harbor, ME, and the White Mountains. School will be getting out later than normal this year due to so much bad weather over the winter but everyone will be out in force on weekends. It's hard to say how much time to spend in each area-it all depends on what you want to do there. I would definitely include Boston, Concord and Lexington for historical things. Minuteman Campground in Littleton will give you good access to Concord and Lexington. I strongly suggest public transportation to go into Boston. New England is pretty small in comparison to many areas in the rest of the country but I would pick one of the more southern states to start in (MA, CT, RI) and then go either clockwise or counter-clockwise to hit each one. You don't way what part of OK you are in, but using Tulsa and Boston as points it's over 1500 miles. Figuring an average of 50 mph (this includes stops but not heavy traffic) that's 4 eight-hour days of driving so you'll need to take 8 or so days off of your touring time. Personally I would pick two or three of the states to explore more thoroughly although you can drive through RI fairly quickly just to say you've been there! If you narrow down what you want to do a little more it will be easier to give you guidance.