I would be very wary of taking online courses. You didn't mention whether you had any experience in teaching, so I will assume for the moment you do not. Therefore, how will you know you will like teaching if you have not tried it?? Online courses, without a practicum are mostly pointless. Despite indepth information on methodology, no one can tell if these ideas will work until you have tried them in the classroom. If there is any way that you can do an on-site course with teaching practice (including part time, long term courses), I would do it.