1. figure out if your profile can be strengthened by any particular activities that can't wait until next application season. Examples include:
a. taking quant classes if your quant background isn't very strong
b. taking quant classes if your undergrad gpa isn't too hot
c. getting involved in community service and/or other extracurriculars
d. going for the promotion at work
2. Get that GMAT out of the way. Your score is good for 5 years. If you have problems with it, you'll have time to redo it. But it's so far out, here's what I would recommend: schedule the test and then start studying. If you say, "yeah, I'm gonna do that pretty soon" but don't have a set time, you're less likely to take your studying seriously.
Good luck. You've got lots of time to put together an amazing application package. Don't squander it.