What is required for "closecurrentobliviongate" to work? IE if I create my own worldspace, what do I need to do to it in order for this to work? Does the player have to enter from an oblivion portal? Does the worldspace have to have oblivion weather? Etc.

It needs to be classified as an Oblivion worldspace; and that's all.
To edit this, on the Worldspace information screen (World > World Spaces... if by some miracle you made a worldspace without opening that window), look at the bottom left hand side of the information side of this window, and you'll see a check box saying "Oblivion Worldspace".

Good luck!

Thank you sir!