How much can hiring a Adwords guy + getting $500 voucher cost and it is good enought to bring suitable traffic?
What do you mean Adwords guy? A consultant? Usually you can find one that will charge 10% of spend or a monthly minimum, whichever is higher. With only $500 I suggest you run it yourself. Bid low to start. You may not start getting traffic right away, but just give it a day or two. You can easily go through those $500.
$500 voucher is good enough to bring traffic. Also hiring guy is not much good. You can do yourself. I always recommend dont loose money with someone else who claim to be adwords expert. You can create your own account and start advertising. With $500, and keeping $0.10 as bid for each click, can get you around 5000 Visitors easily, and can earn money lot.