I am very new to riding and I am wanting to do a three day bike ride. The ride has some hills and it is 30-35 miles long each day. The ride isn't until September 15 so I know I have time to get where I need to be. My question is whats the best way to train for it?
You don't really need to "train" to do ride of 100 miles spread over three days. Just ride your bike as often as you can, over varying terrain. Once you get to be able to ride for three hours in reasonable comfort without feeling totally exhausted at the end, you're ready.
A three-hour ride probably sounds intimidating now, but you have plenty of time. If you can ride 12 miles, that's a great start. Just increase the time on the bike by a few minutes per ride, you'll be where you need to be in no time.
The longest I've gone is 12miles, so for me 30-35 is long.
But it's not really long, is it ... it's just 3 times longer than you currently ride.
Ride a bit this week, and then this coming weekend do a 15 mile ride on Saturday and 10 mile ride on Sunday.
Ride some more during the week, and then on the next weekend, do a 20 mile ride on Saturday and 15 mile ride on Sunday.
Ride some more during the week, and then on the next weekend, do a 25 mile ride on Saturday and 20 mile ride on Sunday.
Ride some more during the week, and then on next weekend, do a a 30 mile ride on Saturday and 25 mile ride on Sunday.
Ride some more during the week, and then on the next weekend, do a 35 mile ride on Saturday and 30 mile ride on Sunday ... and you're there.
If you find increasing the distance by 5 miles a week a bit much, keep the distance the same as you did the previous week for a week or two till you feel more comfortable with it.
Focus on riding at a manageable pace during the long rides, include a variety of terrain.
Focus on bicycle fit. If something doesn't feel right, you might need to adjust it.
Focus on nutrition. You probably don't need to do anything special (other than drinking water) till the rides get over 2 hours, but once they get over 2 hours you'll probably need to eat something, and you may need to experiment with what works for you.