1. Interview — is an introduction needed for the employer so as to assess a potential employee to ultimately determine whether the latter eligible to work at the former's company
2. In order to introduce yourself as a professional and competent candidate, who is not only able to appear organized and robust, but also to flawlessly maintain a dialog with the interviewer.
3. Obviously, you must come on time otherwise you're considered as an incompetent and unorganized dilettante, who is incapable to bear basic responsibilities. If you're unable to arrive at your employer's place, you must apprise them at least a day prior to the appointment.
You should obviously provide your portfolio to the interviewer in order for them conclude your eligibility for the company you're applying to. There's not much to bring there, however, I suggest you not bring a lot of documents, but only the mandatory ones, which will assist your employer to verify and identify you, such as passport, ID-card, driver's license, etc.
4. Behave yourself discreetly, don't appear nervous, smile (though majority prefer not to, believe me, you'll have to), speak directly, don't use habit words, for example: like; actually (merely don't exploit it, instead use: frankly speaking, verily, as a matter of fact, in fact, etc.).
Basically, act cool.
5. Absolutely not if you're not inquired to mention it. If that's the case, don't tell too much of the personal info; in another words, state your basic information, like: Name, Age, Origin Country, Hobbies, Sports, Availability, etc.
6. If the previous job's field is related to the one's you're applying to, then absolutely! But if you were to apply to Google with the experience of a McDonald's counter attendant, it wouldn't make sense at all.
7. Everything is asked here is mentioned above.
8. From the very beginning, to the very end you must occur calm yet totally capable to withstand a constructive discourse.
9. Don't ever say "I don't know", "No idea", "Beats me". Ever. Trust me.
10. Apply to work for another companies, it's not the end of the world if the company you wanted to apply for didn't let you in.
In conclusion, all I want to say is good luck to everyone on job interviews, AND DON'T EVER SAY "I DON'T KNOW"!!!