I'm wanting to get full keyboard and mouse input for my games, but I can't seem to find anything on it in the pico-8 forums or in the pico-8 help itself. It would be awesome if someone could help!

Here's the wiki entry for keyboard & mouse support

Keep in mind that people playing on handheld gaming devices or mobile phones won't be able to play your game if it relies on keyboard & mouse input.

In addition to what 2bitchuck posted, there's also a portion in the pico-8 manual about it, which can be read online here:

https://www.lexaloffle.com/dl/docs/pico-8_manual.html#Mouse_and_Keyboard_Input

thanks for the help @kimiyoribaka + @2bitchuck , this was really helpful info to have!