How to get a job?

I'm so nervous about getting a job I know how bad I need it but I don't have the courage yet. Im a very shy person, and have social anxiety.. Im always quiet with nothing to say unless someone converses with me first. I don't know how to spark up conversation and haven't been around people in over a year.. I'm really nervous about my first interview what do I say? What do I wear? How should I do my hair? What kind of questions will they ask me? Any advice please!! I don't want to embarrass myself