You have asked a question that could require a long answer. Help us a little. What is your age and sex? What previous experience do you have (high school short distances, cross country, none)? What is your goal (finish, under 5:00, under 4:00, under 3:00, under 2:20)? Where do you live?
With a year, you have plenty of time to prepare. I asked the question about where you live because that can help us recommend a local race site to you. Web sites such as www.racepacket.com in the mid-Atlantic area will list all the available races. You can use such a web site to enter, say, a 10k in September and then some 10 milers and half marathons in the remainder of the fall.
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