degree
I have a BA in Human Ecology and a candidate for my M. Ed in Literacy.
For your teaching certificate (mine is K-8) you would need to contact your state dept. of Ed for their requirements. There are several courses that are mandatory for certification, so if your degree was not anything near education you would most likely return to school for the needed undergrad course work, for example Teaching the Exceptional Child or Teaching Methods course (including four, science, SS, math, and english). The staTE Has a check list and they want proof of the course work, not any declaration of work experience. They cross their t's and dot their eyes. Also you must take the PRAXIS and perhaps even the PRAXIS 2 now. The requirements have gone through changes.
There are now programs to help you gain the certification without having to take the undergrad courses..Our state university has a two year program that allows you to earn graduate credits and certification credits too.
Also..the public system (in many places) is very competitve and hard to secure employment regardless of what your undergrad degree is in. To teach K you need to complete the same rigourous course work that you would need to teach K-3 or K-8 or secondary. There is no K teaching degree, and especially with the job market, you never know what grade you will end up with.