I'll explain the process and then you can ask any follow ups that you have.
First, a person doesn't actually press charges. They just file a police report and then the police or the District Attorney file the charges if they choose to do so.
When the actual criminal charges get filed, then a warrant is issued for the person's arrest. The person is arrested at some point and a bond is set. If the person makes arrangements to pay the bond or hire a bondsman to pay the bond then they can get out of jail.
If you can you should hire a lawyer as quickly as possible. Many times the lawyer can do your bond as a part of their fee and, if so, they will "walk you through" the process of being arrested where you just walk in the jail, get processed and photographed, and walk back out an hour or so later.
If you can't afford a lawyer and can't make bond then you would wait in jail until you go to court and then you can ask for a court appointed lawyer and the judge can appoint one.
You will appear at court several times for docket calls, and the judge will set a date for your trial. At some point the DA will make a plea bargain offer and then you can discuss whether to take it or turn it down and go to trial.
If this is your first offense then the offer will almost certainly be for probation.