Answer every question. You can lose a new job if the employer discovers you overstated your qualifications or lied on the appplication. Make sure all names, addresses and phone numbers for former employers and references are current. If doing research is not possible write 'open' or 'negotiable'. Your local library or the chamber of commerce may have information.
First impressions count.
Don't ignore proper grooming and hygene. Dress conservatively, show restraint in cologne and jewelry, polish your shoes, clean your eyeglasses. Bring work permits or work samples, if applicable. Relax but don't be too casual. Also, mind your manners and use good grammar.