You'll need to tell us the model year of your Mac, but going by the CPU, it's probably a 2019 model, which has 3 USB-C / Thunderbolt 3 ports.
You can use a docking station or hub, but the Mac itself can support up to 4 displays directly connected to its Thunderbolt 3 ports.
Apple does not make docking stations. They do have some 3rd party ones in their online store, but there are tons of options out there too that will be cheaper.
CalDigit Thunderbolt 4 Pro Dock - Apple
Neither the docking station nor the displays will have any effect on your Mac's performance whatsoever. If it's getting laggy, there may be issues that need to be resolved. Posting an Etrecheck report will help people here understand what is running on your Mac. It does not include any personal details and is safe to post here.
click here ➜ Using EtreCheck - Apple Community
With that said, pretty much any display out there and any number of docks out there will work.
If you are planning on editing photos and need really good color matching and representation BenQ displays are good options. Otherwise any number of regular 4K displays should work just fine.
You would need to determine what size display you want. 24, 27, 30, 32"? And resolution needs. 4K, 5K, 6K?
You can always connect the Mac to your TV and use it as a display if it's convenient just to see how it would look on that size display.
Any budget constraints?
Docks examples:
click here ➜ Ugreen Thunderbolt dock dual 4K or single 8K displays - Amazon.com
click here ➜ StarTech.com Thunderbolt 4 Dock - Dual 4K MacBook Pro - Amazon.com
click here ➜ OWC 14-Port Thunderbolt Dock, 85W charging, (2) Thunderbolt 40 Gb/s (USB-C), (5) USB 3.2 Type-A, USB 3.2 (10Gb/s) Type-C, Mini DisplayPort, GbE, Audio, Single 5K or Dual 4K Displays, cable, For Mac/PC - Amazon.com
For displays, there's a ton of things out there. as mention BenQ isa good option. LG, Samsung, Asus all make good quality displays.
click here ➜ LG Ultrafine 27" 4K Display - Amazon.com
click here ➜ Samsung Viewfinity 27" 4K Display - Amazon.com
click here ➜ BenQ MA270U 27” 4K 3840x2160 Monitor for MacBook® Pro/Air - Amazon.com