admin account on multiple systems

I am trying to add a local admin account to 300 systems across the network. And remove one as well. I know how to add or delete the user with the net use command but am unable to set the access permissions for this. Does anyone out there know of a way to do this without restarting or having to remote into each system. My goal is to have a batch file that adds a new admin account and remove an old one setting up the password and required rights in the process. Hope I can get some good info on this.