For books based off films (films that are not adaptions), how would one go about obtaining the rights? It is difficult (I personally tried to research) to find the correct person to contact.
I do have an outline and details for an idea but I am unsure about going forth writing the piece if I have no way of the ability to send the final manuscript out to agents with copyright issues.
What would I go about doing?
What you are proposing to write is called a novelization.
The rights are owned by the studio (generally.)
Finding out who to contact is impossible for someone with no connections nor an agent. And frankly, even if you find the right guy, they won't call you back if you're on your own.
Several publishers have novel tie-in publishing programs. They hire writers (usually on a work for hire basis) to write novelizations. As far as I know, those authors all have agents.
But here's my question to you: why on God's green earth do you want to do this? Novelizations generally don't sell all that well, unless they're something like Star Wars or other big brand name franchises or blockbusters.
Write your own book. Find an agent. If you still want to write novelizations, then you'll at least have someone who can help you do that.