As you hold a JAA licence you are probably in Europe. Some countries have glider pilots licences whilst others do not. That is all likely to change under EASA but the time frame for the LAPL which will cover soaring is such that it will probably not be in place until 2015. Until that time you will probably have to comply with the National rules of whichever country you wish to glide in so the best course is to contact the gliding association in that country to find out the rules.
As for logging hours its your log book you can do whatever you want.