Depends why you're getting it. Is it primary vaccination or booster? Is there a wound and if so is it clean or dirty? Is the patient adult or child?
The order is tetanus toxoid 0.5 mL IM.
In primary vs booster the dose is the same, but frequency differs (and you need to counsel/give instructions properly). Refer to your immunization chart:
http://www.aafp.org/online/en/home/clinical/immunizationres.html
Clean/dirty wound affects whether you give tetanus immunoglobin or not:
http://www.aafp.org/afp/20000301/tips/33.html
You'll need to look up the dosing to tetanus immunoglobins ____ units IM x1 on epocrates or whatever.
Last consideration is whether or not you're going to give tetanus toxoid & diphtheria... with/without acellular pertussis (Td or Tdap). I believe there's Adacel & Boostrix.
Hope that gives you a start to look it up.