Petty theft pc 484a first offense

I did a horrible thing..and was arrested and charged with petty theft 484a..caught by target.merchandise added up to $175. This is my first ever arrest.I've heard of something called a deferred prosecution which can eventually have this dropped. What are my chances of obtaining this and does a guilty plea have to be entered prior? I'm terrified and do not have much money to afford an attorney. Please help me. Would a public defender be able to enter this deferred prosecution for me. My main concern is having a conviction on my record for employers to see. Is this my best option? Are there any independant lawyers out there working i the west covina area i can contact?I am willing to do any classes and community service the court gives me in order to avoid conviction..