How do i use rays after creating them?

So im making a gun to my game, and im using ray's to set the position/orientacion/where to stop the bullet and a guy (at another question) told me to use ray's and he gave me this ray:

local ray = Ray.new(hole.CFrame.Position, (mouse.Hit.Position - hole.CFrame.Position).Unit*range)

But now idk how to use them after creating them, i know that i need to use "findpartinray" but idk where to use it , or how to use it. Anyways here's the script:

	local pistola = script.Parent
	local hole = game.StarterPack.Pistola.Hole
	local mouse = game.Players.LocalPlayer:GetMouse()
	 
	-- Lista de Valores --
	local ammo = 12
	local maxAmmo = 64
	local damage = 20
	local headshotDamage = 50
	local range = 100
	-- impedir spamming --
	local spam = false
	 
	    -- Disparo --
	    pistola.Activated:Connect(function()
	        if spam == false then
	             spam = true
	            pistola.Handle.Disparo:Play()
	           local bullet = Instance.new("Part")
	                local ray = Ray.new(hole.CFrame.Position, (mouse.Hit.Position - hole.CFrame.Position).Unit*range)
	           bullet.Size = Vector3.new(range,0.25,0.25)
	           bullet.Position = hole.Position
	           bullet.Transparency = 0.5
	           bullet.CanCollide = false
	           bullet.Anchored = true
	           bullet.Parent = game.Workspace
	        wait(0.5)
	        bullet:Destroy()
	            spam = false
	        end
	    end)

Could you tell me where to use it, if i need to add something else and also a fix pls :D Thx! (also pls send an answer, dont add a commentary pls)

If you don't know how to use them check the wiki article, there's even a raycasting article on it.