I dont even have my roadie yet but I bought a entry level cateye computer, a couple tubes and a flat kit. I dont have any riding clothes(wear moisture wicking clothes),shoes,clip in pedals, etc.
Didn't stop my fat butt(5'6"/190lb) from riding 30 miles to the beach and back today averaging 15.5MPH on a 35lb MT bike(with 1.5 slicks).
I'm sure shorts would help but I'm not that uncomfortable.
Shoes are nice but I'm not made of money and when you consider $150 for some pedals and shoes I may never buy them new.