Tks again..
In fact, i'd like a module, let's say "B" on front end (as another one is already available for all users , named "A" for newsletters subscriptions) (see screenshot).
After registering in that module "B", users will access editor for publishing or using another kind of service ex: classified ads., forum etc...The content made by these users could only be seen by them , but sometimes, for general topics (specially articles), could be also read by all users registered (A + B) or all kind of Visitors (A + B + V).
Content will be free of charge in any kind of availability (A or B ). At the end, i 'll have 2 lists of separate users to manage.
Hope make myself understand.
Tks again for your help..