Thanks for viewing my question, I'll just dive into it.
What I Want To Happen
I have a game where First Person is required, and I also have a ScreenGui that I want the player to click. The problem is, that First Person is already locked, and it'll be impossible for First Person to be locked. I have a solution although; To have the mouse move freely, and still have First Person Locked.
So...
I have no idea how this would work. Can you give me resources, examples, etc. Thanks!

7 comments
Well, I failed....
But I want it to happen out of startergui as well, but this was VERY useful. Thank you.
@GreekGodOfMLG The elements of StarterGui will transfer to the player's PlayerGui each time they spawn.
Put a TextButton in the StarterGui with Modal = true
@Spongocardo I want it outside of the Gui as well, like no Gui, and just outside and in the game/place
@GreekGod, just make the Button with Transparency = 1 UDim2.new(0,0,0,0). Test it out, I think it will work for you.
@Validark It worked! Thank you!