There is a difference between the Sheol (also referred to as Hades) and Gehenna. Also there is a difference between Paradise (also referred to as the bosom of Abraham, Isaac and Jacob) and the full glory of Heaven. The following is a short article, and I think it will give you atleast some idea of what the differences are:https://sites.google.com/site/syrianorthodox/home/articles/heaven-and-hell
It is impossible to understand Heaven..Paradise, Hell, Gehenna etc completely. Forget about the next world; we dont even understand ALL the things that happen in this universe that we live in.