I would just try to run about the same mileage as you did over the summer, maybe a little more if you can handle it. Try to run as much outside if possible. If you can't get outside, use the treadmill or bike, but at least do something.
I would do a long run of about 11-15 miles each week if you plan on doing 55-70. I would also throw in a secondary long run of about 9-12 depending on the week's mileage. Be smart about building up your mileage. On the other days, just run at an easy, comfortable pace for as long as you feel. Do doubles if you want to. As far as tempos and fartleks go, I have found that those aren't really necessary until late January to mid February, but you can do them as you like. Definitely don't do more than one a week, though. You won't want to lose speed, so it wouldn't hurt to throw some race pace surges into those easy runs or to do 4-8x100m strides a couple times a week.
Consistency is the key. Last winter I did something similar to this but too many times I wouldn't do anything if the weather was terrible. As a result, I had a lot of weeks in the 50-60 range and some in the 30s. While my times still dropped a lot, I feel like I could have done a little better. I hope this helps.