As far as certifications, it changes in every state. Also depending upon the school you choose to work in, you may not need to have an education certificate either. There are rules and percentages that need to be followed, but not everyone needs a certificate right away. Your previous degrees can and will be very helpful, even at the elementary level. To find out the pay scale, simply look up your local school district, you will probably be able to find it pretty easily, but you're probably looking at less than $40,000.
Teaching is far from a walk in the park. It is really hard, really tiring, and you are grossly underpaid for both the time you put in and the energy you expend. There are all different types of personalities that work well for teaching, but the underlying factor is that you have to love what you're doing, because you're surely not getting paid for it. The most important personality factors I think are that you'll have to be able to calmy deal with parents who think you are a mean, dumb, idiot who doesn't know how to be a teacher. Not all parents are like that and in fact most aren't, but the ones that are have perfected their skills! ;) Can you take criticism well? Can you follow rules that you think are dumb? Are you a timely person?--You will need to be an excellent manager of time to get in all your required curriculum, and then some, and also for paperwork like lesson plans and report cards that will be due for your administration.
A typical day in the day of a teacher is mostly spent on minutia. You will deal with more issues over stolen and lost pencils, restroom breaks, and hurt feelings than you know what to do with. You will wonder how and why any learning is expected to get done, and you will go home exhausted...with papers to grade and lessons to plan. You will be required to stay late many nights for required duties, clubs, meetings, conferences, etc. The nights you are not required to stay late you will stay late because you have work to do and if you can't stay late, you'll take work home or come in early.
I'm truly not trying to be negative. I love teaching and I love kids, as I'm sure you do too or you wouldn't be thinking about this, but please don't consider this job lightly. It is not easy and the time you think you will gain by being able to come home and spend time with your family, could quite possibly be lost to the job. Additionally, do you have it in you to work with children all day and then come home to your own where you still have to be patient, kind and loving and still educate them? Some do not. Education has the potential to be one of the best and most rewarding jobs of your life, but it can also make you miserable. You have to really decide if you're looking for this kind of commitment or if you're just looking for a better schedule because you absolutely should not do it if it is only for the schedule. It isn't fair to you or to the kids you will be teaching.