Lots of questions you're asking - without more specific information, I'm afriad we will be of little help.
Where are you living?
What age/or subject do you want to teach?
What educational background do you already have?
Depending on your answers to the above questions, where your certification comes from and how long it takes will vary. Many universities and community colleges offer programs and courses for those aspiring to be teachers. Look at the program offerings for those in your areas.
Financial costs and aid will depend greatly on where you are, your current academic strengths, and what program you choose to pursue.
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Calling from deep in the heart, from where the eyes can't see and the ears can't hear, from where the mountain trails end and only love can go... ~~~ Three Rivers Hare Krishna
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