Tetanus vaccination should be given once a year.
Strangles is also given once a year IN HIGH RISK SITUATIONS. Strangles is not a vaccine that all horses shoud be given due to the increased risk of severe adverse reactions associated with this vaccine.
There are also several other vaccines that should be given as well as just Tetanus and Strangles.
If you don't know what to give, when to give it or how to give it, you definitely need to talk to your vet. Vaccination schedules vary from situation to situation and location to location because risk factors vary. You want to be sure that you are giving the appropriate vaccines and at the appropriate time for your area and situation, otherwise you may think your horse is covered an he may still be very much at risk.
note: The Equisite article is handy, but not completely accurate and I wouldn't base my vaccination schedule solely on that information. Always consult your vet to determine what exactly YOUR HORSE needs.
Licensed Veterinary Technician