Add Indicator to a existing EA and spread /slippage input

Specification

The Existing EA I have is based on the No Repaint Half Trend indicator.

Please remove the Half Trend indicator from the EA .

Please Code the Custom Parabolic SAR indicator in its place as it will be the main entry and exit indicator now .

Please Code this EA with a view to be able to add more indicators , filters in the future if needed.

Please include indicator settings in EA inputs. 

If its easier to Start the EA from scratch let me know but I'd like to keep all existing inputs and code the EA currently has.

(Lock to account and expiry date code must remain)

So the entry rules are  (same as the Half Trend indicator currently in EA).

When the SAR Dot is locked in place (at the close and locking in of the candle) the EA will close the previous trade position (if there is one) and 

open a new Buy or Sell position that must be inline with the Candle colour (Blue for a Buy or Red for a Sell) .

Exit Rules (Also the EA will open a new Position Simultaneously at the open of the new RENKO candle) .

At the Reversal and locking in of the SAR Dot the EA will close the Trade Position but only when the Candle is fully closed locking the SAR Dot in place and

then the EA will open a new reversal trade position Simultaneously 

 The EA should not trade as soon as it is attached to the screen it will wait for a new valid signal

I also need inputs added to EA - for spread size , slippage , pips above /below last swing high/low option for SL ,

Fixed lot size is already there .

Regards

Passive X