What not to skimp on for a bike touring trip?

Hey guys, I'm planning on biking from my parents' home in Ohio to my home north of Boston.

I've decided on my 900 mile route. On 7 out of the 10 days I'll be sleeping outside.

My longest previous trip was 600 miles over 4 days (with lodging on each night.)

I need:

- Luggage racks and...