How to make a "graphics" slider?

I am currently making a game which feature my own graphics slider to remove crumbs (bushes, flowers, and tall grass) and loose bricks, wood, or dirt from the map.

Here is the code I am using. (I made it myself, and I am an amateur at scripting GUIs.) And I haven't made the GUI yet, either, as I am not good at make sliding GUIs. Perhaps a number GUI would work. From a value of 0-1.

And the crumbs and debris are put into different players. So if one has his or her graphics settings down, then everyone who has their's up can still see the extra detail or vice versa.

local crumbs = game.Workspace.Players.ObjCrumbs
local debris = game.Workspace.Players.ObjDebris

if findFirstChild("GraphicsSlider")
    then
    if GraphicsSlider.Value = 0
        then
        findFirstChild.game.Worksapce.Players.crumbs
        crumbs(Destroy) else
        crumbs(Keep)

        if GraphicsSlider.Value = 0
            then
            findFirstChild.game.Workspace.Players.crumbs
            crumbs(Destroy) else
            crumbs(Keep)
        end
    end
end