Build an EA from indicator (MT4)

I have an indicator that displays LONG & SHORT signal arrows. Would like to have an EA based on this. Besides that, the EA will also manage manual trades. Trades can be opened and closed manually.

Rules :

1) Indicator shows SHORT signal

a) No position open - EA will open a position

b) Manual SHORT position open - EA will not open a position

c) Manual LONG position open - EA will close the position and open a new SHORT position

2) Vice versa for LONG position

3) Only 1 position opened at a time

4) Trades can be opened and closed manually

5) Positions opened by EA will follow the lot size settings set in the EA parameters. EA will not interfere with manually opened lots sizes.

6) The indicator "repaints" the signals based on price movement. To confirm the signals, wait until signal bar is closed

7) Sent email every trade the EA has taken.

8) OPTIONAL :Show connecting lines when a pair is completed in the chart (example open long, close short OR open short, close long)

EA Parameters :

Lot Size : 0.1 (default)

Slippage :3 (default)

Invisible Stop Loss : 0 (default)

Secure profit1 : 100 pips (default)

Secure profit2 : 50 pips (default)

Trailing stop : 30 pips

NOTE : Will be running the EA on a VPS. Please ensure the EA does not use too much CPU power as will be running with several other MT4 indicators and multiple currency pairs. Therefore parameter settings are up for discussion.

Thanks.