Re: What to say in an interview
As someone who has been on both sides of an interview both as an interviewee and an interviewer, there are a few things I can suggest.
Dress smart, first appearances DO count. Make sure your shirt is tucked in, you aren't wearing clothes with holes or stains and nice shoes. Depending on what type of job you are going for either a suit or a collared shirt and nice slacks.
Be well groomed, make sure your hair isn't messy, you have brushed your teeth and you don't reek of b.o.
Be confident. Give a nice firm handshake when you walk in (unless it's a girl in which case a limp wristed handshake is okay) smile and exude confidence.
Be prepared to answer questions. The employer is going to try and put you on the spot and test you, make sure you do homework about the company and also the usual "why do you think you are right for the job" type questions.
Don't be afraid to ask questions yourself. This shows that you have a genuine interest in the job. Try to avoid asking about wages though as that might just indicate you are only interested in the money.
When you leave, thank the employer for the time and giving you the oppertunity.