Need help on training for cross country?

So I’m thinking about doing cross country or soccer next year for a sport in the begining of the year to have something to do and I’m leaning towards cross country. But the only problem is i’ve never really run before, only a few miles in gym class in middle school every now in then. Next year I’m going to be a sophomore and I wanted to know what exercises and what schedules I should start doing over the summer to increase my endurance?