I have a question regarding about the Security Clearance at a Air Force in US. I have phone interview next Monday and I do not possession security clearance. I am wondering if I am suppose to have them before getting hired ? I do not know what is the process and what are the requirements ?

The job I am interviewing is in another state and where I live is a military nearby about 30 miles from my home.

If I get an offer and need to do the security clearance, can I go to the one near my home military base and do the security clearance ?