OP, i started my first automated trading system in excel on a retail platform.
Does your broker allow you to pull data into excel? order entry via excel? Just build out your signal in excel and use conditional formatting to enter orders.
If you can get that far you'll start learning about macros and VB, from there it's a pretty big step to something like C++ but you'll better understand what you are getting yourself into.
The trade you suggest in your first post can easily be executed with excel.