simple coding

We require php coding to achieve the following: To create a profile page for a user when they log in. The profile page should give the user the ability to upload photographs and personal information. We require the facility that another user can search to see if a partular user is available on the site. Furthermore, if a user chooses an user id which is already in use we want this oding to advise of this. secondly, and seperately if a user makes a a particular selection we would like a virtual object to appear ( we require discrete coding to reflect this).