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Congrats on your new Martin. I picked up a 2011 Martin HD-35 last year and love it. Monitoring the humidity is very important to keeping your guitar intact and most recommend keeping between 40% and 50%. Martin recommends 50%.
Where we live (Jersey shore) it gets very dry in the winter and very humid in the summer, and so I am constantly keeping on top of the room (basement) humidity with a good room Humidifier in the winter and a Dehumidifier in the summer (No A/C in the basement). Through experimentation I have found that the Martin seems to be real happy with the humidity is sitting in the 48% – 52% range. The other 2 (non Martin) guitars I have don’t seem to be a fussy (: With the Martin you can hear and feel the difference.
Like the others said here, I would also recommend acclimation for a day or even 3 before you get it cranking. Enjoy.