I know you mention posing and PP but have you a clear idea of what you wish to get from a course and if you think your target is achievable? I must admit, I've never taken a course for a couple of reasons a) I could never decide which one; and b) I wasn't sure if I would get enough out of a course to justify the expense.
With regards to posing I would highly recommend the David Pearce book Wedding Photography - A Guide to Posing. There are also many other training resources out there both online and in the written form that will be able to help you. With regards to PP I am going to make a big assumption that you know how to use your editing software, if so what are your areas of weakness that make you think you require a course? I think every photographer has to develop their own style and this comes from a combination of eye, composition, posing and post processing. Have a look at my work, then check out Simon Revill's (spxxxx) and Guy Collier's (Radiohead) - we each have our own style and whilst I can't speak for my own images Simon's and Guy's are instantly recognisable (to me anyway). Their styles have not come from a training course but from their own interpretation of an image and we all apply our own consistent processing techniques - this does take some time as you develop your style and workflow but you will get there eventually.