That is so much more money than you will need. I'd save more money, if I were you. The rent in Irbid is nothing, compared to Amman. Don't let anyone try to take advantage of you.
The most I have ever heard of anyone paying rent, for a very large and new apartment, is 250 JDS (unfurnished). Meals will cost from less than 2 JDS to 6 JDS. You might manage to spend 10 JDS at a more upscale restaurant.
Also, you can go by taxi anywhere within Irbid city for 1 JDS, 1.50 JDS maximum. Make sure you confirm the price when you first get in the taxi. Irbid taxi's don't have meters. Majority of drivers are honest, but there are always the one or two that try to make a little money off visitors / foreigners.
Same goes for shopping, know your prices. I usually check several stores to have an idea of what an item costs. This way you are prepared when someone tries to gouge you. Be prepared to just walk away, if they refuse to bargain with you.