There is a great module for people you registred manually but you need to give them login information after this. It is one time login module but it lacks option to redirect users to their user edit page, which is the first thing they should do, enter their NEW PASSWORD.
So i made a little hack for this. Open module file and go to 508 line and just add this line
$path='user/'.$account->uid.'/edit';This will redirect your users to their edit user page directly on first login.