sensitivity for mouse

TL;DR: What’s a good sensitivity val setting for a Red Thunder Mouse (images attached)
Context: I recently upgraded from a simple Lenovo laptop and mouse to having a real PC (coming in 2 weeks) and a Red Thunder brand mouse and keyboard. I never had a luxury of this, so I’m still figuring out how to use all the components it offers. I’m not really sure what a DPI or what anything of it means but what is a good sensitive setting I can use for the mouse? I apologize if it’s hard to read this well because of my english.
Additionally: For anyone familiar with keyboard and mouse like this, how do you change color settings of the mouse to match with the keyboard and not change colors every few seconds? Thank you!
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