When I first came here I taught English for a while until I could get the job that I wanted. Some advice given to me was to avoid the online TEFL or TESOL courses as they are not taken very seriously with some employers, obviously as it is very easy to issue fake certs. They instead said they would view a certificate from the British Council here or a recognised educational organisation in the UK as being more believable. As it was I taught English in a learning centre with no teaching certs whatsoever. One thing to remember about working in a learning centre is that they are there to suppliment English taught in schools and at home so the hours are a little anti-social as obviously you can only teach when the children are not at school. You would certainly have to work on Saturdays from about 10am to about 8pm, with very little time for breaks, and during the week hours are from about 1pm to 9.30pm again with no breaks. To work in schools the basic minimum requirement is a TESOL or TEFL and one years teaching experience, but this is rare and most schools ask that you have teaching certs as well.
Also if your husband is coming here on a working visa remember that you will have no rights to work here, you will have to apply to immigration to have the right to work and they may/maynot permit this depending on your work skills, qualifications, etc.
jaykay