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)