What should I do in order to prepare for cross country?

I would definitely start with a distance that you're comfortable with. So, interchange whatever number you decide on with the number I have for the first week. I would recommend starting with maybe 3 miles/day in the first week and then weekly increase the mileage by 1-3 miles per run after that. To supplement your running and help decrease the chances of injuries, I would strengthen (via endurance vs. strengthening for pure strength) your body's core muscles: calves, quads, hams, back and abdominal (the "six pack" muscles along with the obleks), chest and arms. I would definitely get some free weights or get a membership at a gym (depending on your finances and your knowledge on how to strengthen your muscles). I would definitely stretch a lot and stay flexible as as possible because flexibility leads to better balance (so do the muscles in your core) and also helps to prevent some injuries like pulled muscles and shin splints. Also, I would try to make up a schedule where you can run for X amount of days and try to have a long run. Running is a lifestyle, thus you need to have: a good diet, great hydration, enough sleep, a good sense on how to take care of your body, and more sleep. Feel free to contact me if you have any questions.