We don't have a set rule on who takes part in a trade first (we leave it up to the members to deal with it themselves), but you'll probably find, as a new member with absolutely no trading history, people will be more wary of sending their wares off to you without you sending first. Just a head's up.
Welcome aboard!
I can trade 4 Golds for a Suzuki SX4 WRC from the Premium Dealership (850,000credits); at around 6pm GMT
I'll trade you a Suzuki SX4 WRC bro, I have 2 for some reason and i dont think its a prize car