EA and DLL to enable 2 way pipe/socket communication between MT5 and a C++ App

I have some C++ programming knowledge, and I want to be able to write my own Expert Advisor in C++ and have it communicate directly with the MetaTrader 5 platform to get price data and open/close trades. Therefore, I would require an EA in mql5 along with an accompanying dll to allow 2 way communication between the mql5 EA and my C++ application.

Some communication examples that I can think of are:

-Currency Symbol, get last 'x' prices Open,High,Low,Close (bid or sell side), 'y' min/hour/day/month timescale
-Currency Symbol, open trade at current price, BUY/SELL, set SL, set TP etc.
-Currency Symbol, get status of trade (priced opened, current price, profit etc.)
-Currency Symbol, close trade at current price etc.
-close all open trades
-Get account status, balance, equity, etc.

I'm thinking that maybe all these functions should return comma delimited strings.
Another note: I'll want to open more than 1 position at once, so the positions will need a unique identifier.
As I am a complete beginner in forex, please feel free to add to/change the above examples of communication functions required in the dll.
Please provide me with a guide price and your proposed solution for this project.