Drupal website Enhancement

we have already developed website in drupal. following enhancement we are looking for 1. Configure SUbsite , so that every user can come and create/manage his own subsite. 2. Configure Gallery , So that every user can manage his own photo galleries and upload photos under it. (gallery is working but not as per user) 3. Configure Scheduler : so that we can show events created by every user (Scheduler is as well workiing but not user wise) need to make page for user where list of ragistered user under one role can be displayed. after clicking on user detail we can see all 3 listed above. some minor design hickups need to be cleared. please provide me deatiled info about cost and time for individual and complete.