I just ordered one of these to drive my LEDs, and i am wondering if it comes with a cord to plug into the wall, or if i need to get one and wire it in? https://www.aliexpress.com/snapshot/0.html?orderId=85159373264645&productId=1603712949
Your link is unique to your browser. I would remove it and find the generic page that everyone sees. However, If the supply is just shown as a shiny metal box with a screw block. Then yes you well need a cord.
I'm no expert. however I think any grounded 3 prong type found at your hardware store should work. I had a spare computer power supply cord I cutup and attached. It works well.
Basically yes. But (yes theirs always a but) you should keep in mind that there is a right way and a way that well burn your house down. Have a look at the you tube link below, it's describing the proper way to wire a power supply.