Identify the + of the power supply
Identify the - of the power supply
Identify the - side of the LED
Identify the + side of the LED.
Your missing ring terminals and an appropriate screw, washer and lockwasher. Something like this:
**broken link removed** The ring should be the size of the hole and the crimp part should fit the wire.
This requires a tool such as this one:
https://www.surplustronics.co.nz/products/4484-stripper-cutter-crimp-tool
Soldering looks like an option too.
Here is a suggestion for the heat sink grease:
**broken link removed** You place a light film between the LED and the heat sink before attaching.
Your going to have to find a case and a cord and this is just one possible cord:
https://www.surplustronics.co.nz/products/3983-iec-power-lead-3-pin-plug-to-iec-plug-right-angle
Something like this:
**broken link removed** is a mating connector. If you used something like this
**broken link removed** you would not have to solder.
An alternative method is to get a box and a cable gland and pass the insulated wire through the box. Use wirenuts inside the box for the power.
Then you have to pass the LED wires out through a grommet and tie an Underwriters knot on the inside.
https://www.animatedknots.com/under....jpg&Website=www.animatedknots.comUnderwriter
A lot goes into putting something together. And you probably will have to strain relief the LED wires too.