Having some hills close by is perfect and the one with the two mile and one mile climb is perfect. For me it works best if they are not too steep and that one should work fine. I have a harder time getting my HR up high enough on flats for some reason.......unless I'm pulling a group and intentionally drive it up--motivation maybe?? For me a 2-3% grade works best as I can pedal at a pretty high cadence.

Anyway, you probably want to determine your max HR or at least your anaerobic HR (hopefully you have a HR monitor??)........the point where you really have difficulty talking. Do some riding and warmups over to the hill. Then head up the hill taking a period of time where you go all out to get your HR up to the point you cannot talk and breathe and then keep that pace for one minute. For me it is easier if I can keep my cadence 80-95. You want to spin more than you feel like you using too hard of a gear. After a minute continue to ride but a a slow enough pace to let is drop back down by about 15-20%. Then go at it again for one minute as hard as you can go. You should be able use both the front and back side of the hill to do these.

Repeat as much as you are able. Over time you can increase the duration of the interval and also the number. The key is to make sure your HR drops back down well out of the anaerobic level after an interval before you start it up again.