Oh, yeah as far as training routes, check out MapMyRide.com, set your city to Bethesda, Arlington, etc. and check out where people ride. Military Road in Arlington is a nice interval/climbing type route. There are plenty of good on-road routes in the area and I know Conte's does shop rides from both Arlington and Bethesda (I've ridden both) which is a good way to familiarize yourself with a bit of the area.

On the MD side - River Rd, Falls Rd, MacArthur Blvd are very popular main riding roads... Just a couple I'm familiar with.