Been there twice in the last 2 years, all went well. It was hard work, just try get the exams out the way first, or at least study a lot before you go, It will make it all so mu more enjoyable, leave yourself at least 25 days.
OBA is basic, with a nice fleat of aircraft, they will not spoonfeed you, but they will teach you to fly and get you ready for the skills test
Dont expect too much from their email responses, they are real busy, and won't hire people to answer emails, that the answers are most likely on their website. They need to keep the cost down as much as possible to stay competitve.
Once you sign up, you will get all the info you need, a total idiots guide to get the visa's, travel info. And then you will hear nothing till you get there. As there is nothing else for you to do