SharePoint 2010

I have SharePoint 2010 with Form Based Authentication. I am using [login to view URL] . I am using [login to view URL] Installation method for both FBA pack and Form Based Authentication. In this FBA Pack only System Administrator can create user and Site Setting Options only be seen by System Administrator Now My requirement is My System Admin will create user and he will give some of the user permission to make users. Now I need like user which he create cannot seen by other users. It is like team. Now System admin give permission to make users can also give permission to create user. Same cycle will go on. In short parent can see child team members but one team cannot see other team. Kindly can you give estimation of time and money for above.