RE: How to bring existing environments (production and UAT) to LCS
You need to start this process in dev, definetely not in UAT and ABSOLUTELY not in Prod! You are clearly not following the process in MS documentation. Asking help on forums will not substitute reading and understanding (and following) the documentation.
A dev/test system should have at least 16GB RAM if you install everything on one server.
Follow AX installation guide to install the components. Then copy prod databases (model + business) to that system. Change all environment specific setup in the data before starting the system. Google for "ax 2012 copy prod to test"
The more you tell about your situation, the more worrying it sounds. Don't you have an implementation partner who knows AX? If not, your business is at risk and I can't recommend installing the CU until you have knowledgeable people on board, and have your environments and ALM (application lifecycle management) processes set up properly. Fix the basics first before continuing your attempts with advanced stuff. How did you end up in this situation, with no technical people who know the system?
I recommend you reach out to your local Microsoft representative and ask recommendations about local partners. Then reach out to a partner and work together from there. That's the only sustainable solution for your situation.
I, or anyone else, can't make your processes and systems work via forum discussions.