Anyone help me making a missile launcher script for my cannon gun?

A couple things you need, A local script A regular script A remote event

Local Script will get the Player's Mouse Position On Click Then it will fire the remote event

The regular script will pick up the remote event and send a ray in that direction.

RemoteEvent- well, sends the information from script to script. Since it seems you are new to programming, I can help.

-- LocalScript
local tool = script.Parent
local plr = game.Players.LocalPlayer
local chr = plr.Character or plr.CharacterAdded:wait()
local mouse = plr:GetMouse()
local event = tool:WaitForChild("RemoteEvent")

tool.Activated:Connect(function()
event:FireServer(mouse.Hit.p)
 end)

Divider

-- Regular Script
local tool = script.Parent
local event = tool:WaitForChild("RemoteEvent")

event.OnServerEvent:Connect(function(plr, info)
local origin = tool:WaitForChild("Handle).Position
local direction = (info - origin).Unit * 500 -- change 500 (range)
local ourRay = Ray.new(origin, direction)
local ignore = {plr.Character}
local part, position, normal = workspace:FindPartOnRayWithIgnoreList(ourRay, ignore)
local explosion = Instance.new("Explosion", workspace)
if position then
explosion.Visible = true
explosion.BlastRadius = 20 
explosion.Position = position 
end
 end)

Sorry if this doesn't work, I have not tested it, I just made it here, also sorry if its too little design I made it in a rush.