Like
@SeanS is doing, you'll need to either put the seeds in the fridge for about 10 weeks or sow the seeds in the ground this fall. That's because most maple seeds have a cold dormancy requirement. Otherwise, the seeds won't sprout the first year (for example if you sow them in the spring, they would emerge the following spring unless you had already satisfied their dormancy requirement).
You can put them in the fridge in a ziplock bag with a moist (not dripping) piece of paper towel. After about 10 weeks or so, you should see little shoots starting to emerge - at that point you can plant them in your substrate of choice. The tricky part is that if you put the seeds in the fridge now, they might start sprouting in November - which is a terrible time to put newly emerging seedlings outdoors in zone 7. If you have an indoor growing set up, this is less of a problem.
If you don't have an indoor growing setup just collect the seeds now and keep them dry at room temperature until December or so. In December, hydrate them in a glass of water overnight, then put them in the fridge and hopefully they will start sprouting in late February - March.