Emailing RPC Electronics, if you do not have a crimper for PowerPole connectors they can pre-crimp 12 inch pig-tails so you have something to work with. Alternatively, you can get a crimper for around $10 that has good reviews.
GB GS-388 8-Inch Crimping Electrical Plier
In most Youtube videos I see on PowerPoles, they use and recommend this ($35) crimper:
Anderson Powerpole TC-1 Crmper for 15/30 and 45 Amp Connectors
I came across this box while looking at PowerPole connectors. They look like something I'd like to try. I like the way they clip together. Lots of Youtube how to videos on the subject if interested.
Let me also add a few links for newbies like me that come along later that have no idea what this is all about:
Using a PC Power Supply for Accessories
How to Convert a Computer ATX Power Supply to a Lab Power Supply
(make sure to read all the warnings)
Best source or 12V DC power supply
I've found one of the hardest things getting started is not having all the information in one place.