Scripts for buy/sell order at market price

Hi I need someone help to create a script. (I am not sure whether it's more appropriate to call it an EA or script). I want to use it so it can help me to put buy/sell order at market price instantly.

When I place long order the script will do the following things:

- buy at market price

- stop loss is twice the ATR (7)

- target profit is four times the ATR (7) plus spread.

- script will calculate the position size automatically depends on the amount of money that I want to risk.

When I place short order the script will do the following things:

- sell at market price

- stop loss is twice the ATR (7) plus spread

- target profit is four times the ATR (7)

- script will calculate the position size automatically depends on the amount of money that I want to risk.

Other requirements are:

1. The script can be used on different time frames.

2. It works on 4 or 5 digit broker.

Thank you.