How to set Projectile fire rate?

I was making a projectile gun, and I am having trouble with the shooting. It works fine, but I want to make it only shoot once when clicking once, then holding down shoot multiple times. Any advice on how to do that? My script:

local tool = script.Parent
local handle = tool:WaitForChild("Handle")
local barrel = tool:WaitForChild("Barrel")

local cas = game:GetService("ContextActionService")
local rs = game:GetService("ReplicatedStorage")
local fire = false
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

function shoot(actionName, inputstate)
    if inputstate == Enum.UserInputState.Begin then
	fire = true
end
    if inputstate == Enum.UserInputState.End then
	fire = false
end
end

function bullet()
    rs:WaitForChild("GunEvent"):FireServer(tool, barrel.Position, mouse.Hit.p)
    wait(0.5)
end

cas:BindAction("Shoot", shoot, true, Enum.UserInputType.MouseButton1,
               Enum.UserInputType.Gamepad1)

game:GetService("RunService").RenderStepped:Connect(function()
        if fire == true then 
		bullet()
 end
end)

(There is other scripts connected to it to make it work, I'm not sure if I need to send them).

I have this code in my gun, that keeps repeating shooting, until it runs out of ammo. Not sure if you have ammo or not. The firing basically keeps the gun shooting, until it runs out of ammo, or the player lifts their mouse up. Your using different input methods, but this works for me!

mouse.Button1Up:Connect(function()
		repeat 
		wait()
		isFiring = false
		until isFiring == false
	end)

    mouse.Button1Down:Connect(function()
		isFiring = true
	repeat
		--if ammo.Value == 0 then 
			--isFiring = false
			--break
		--end
       
			wait()
			
            Shoot()
		
		until isFiring == false --or ammo.Value == 0
    end)