How much space should I dedicate to my job experience in a resume.I only worked in 2 places...so I don't have so much experience.Please give me an advice.

Your resume should be one page long, so you could dedicate a few lines to your job experience . Try to emphasize your education, your skills, your abilities… if you don’t have much job experience ( In this section- mention the positions you held, the name of the company you worked for, and some of your duties). Write a functional resume ( in my opinion this kind of resume best fits you).
See this for more help:
http://www.cvtips.com/functional_resume.html

The one page resume is pretty much a myth or thing of the past. When people only changed jobs once or twice in a lifetime, it was probably a good rule of thumb. Those days are over, people switch jobs and careers many times throughout their working years now. My resume is roughly 4 pages.

Try to be as detailed as you can about those jobs without getting into trivial tasks like “answered phones”.

Sell yourself; tell them the things you NEED them to know about yourself.

What I have been told is that until you have spent at least 5 years in the work world (usually meaning the post-college work world), your resume should be only one page.