Stall bars are such a great piece of equipment to use!
There are a lot of great resources out there that can teach you how to use them safely. Here's a fantastic article we can recommend having a look at which explains how to practice basic strength training on stall bars.
We have another article which goes through a number of mobility and flexibility exercises you can do using the stall bars. This would be a good place to start.
If you're looking for a place to purchase stall bars, we highly recommend Rogue Fitness. Happy training! :)