I agree with pete, a tutor is essential to getting the most out of your TEFL Course. You not only get support with questions that you may get stuck on, but you get valuable feedback that can make a big difference to your learning experience.
As well as the courses above, i-to-i have a brand new and interactive online course
that's definitely worth your consideration. i-to-i courses are hosted on an e-learning platform similar to what open universities use, and you get tutor feedback within 24 hours. Both of these factors make a big difference to your learning.