So I logged in my 1000 base miles!!

I'm ready to begin my interval training now. I am just curious what people around here have started w/ as their interval training?

I'm looking to build speed and endurance. I would also like to be able to tackle in some hills
I know that the only way to do these things is to ride ride ride and ride hills... but am just curious to see what has worked for the members here.

THanks!