Youtube is a fantastic IELTS resource and there is a lot of extremely good material out there. Perhaps there is too much, so here are two places to start:
voxguru: for me the king. The videos are low tech and unexciting, but the advice is as good as you will find anywhere.
EnglishRyan: also very sound advice here on the process of writing. This is a subject close to my heart and he talks a lot of sense. We may use slightly different language, but broadly we are saying the same things. Check him out.