The fact is, yes, you need all of them: bibshorts, jerseys, baselayer, sweat bands, cycling glasses, clipless pedals (save yourself some trouble, go straight to Speedplay Zero), shoes (Specialized), a new saddle, and a cycling computer. And get to know PBK (probikekit.com), Performance, Competitive Cyclists, Jenson USA, Chainlove, Real Cyclists, etc.

No, you don't need the dork disc and the reflectors, so take them off if they came with the bike. But do get a decent, blinking, LED light and use it regardless if you ever ride on the road.

One more thing... post pictures when you get the new bike.