Normally the SA would go through a pre-delivery checklist, where he'll show u what is where, how to use it etc etc.... Take ur time to scrutinise the car front to back, inside out, as once u sign on the dotted line..... its ur responsibility only.
Visually, check for scratches (if any) on all surface, including tyres n rims. Ensure the necessary tires are at properly mounted (especially if ur on a staggered setup). crank up the aircond to see if its cold. look at the fuel gauge (if the SA promised a full tank!). inspect the engine bay. inspect the tint installation (if they provided the tint). all booklets in place.
keep on asking questions, no matter how dumb u think it is. remember, the SA has to get u to sign on the delivery papers. Dont rush this, as if anything is wrong, u can still refuse the delivery.
Best of all, take lotsa pictures.... then upload here and start ur thread bro.
CONGRATULATIONS!!