STOCK trading system building

[klevera]

hi there i'm in the middle of building a back testing system, but i'm somewhat stuck in the middle.
Basically, i want to find stocks within a tight range in the morning.
Those are the conditions that I want.

1) 9:30-9:45 range should be lower than 14 days ATR*0.25
2) That 15m range should be less than 0.45 cents
3) The average std(standardization) of 15m(HIGH,LOW,OPEN,CLOSE)/ stock mean price of 15m * 100 should be lower than 0.1


Long condition(1-3 conditions are already met)
1)Open change of that stock- open change of spy> 0
=>If it breaks above the high of the 15m range go long

Short condition(1-3 conditions are already met)
2)Open change of that stock - open change of spy <0
=>if it breaks below the low of the 15m range go short

Stop
=0.10 cents(fixed)

Profit
1)First target= the range of 15m
2)hold the half to the daily ATR range




function preMain() {
setPriceStudy(true);
setStudyTitle("Back Test: Low ATR Breakout");
setCursorLabelName("15range", 0);
setDefaultBarFgColor(Color.RGB(0x00,0x94,0xFF), 0);
}

var bInit = false;
var fifteenmin_high;
var fifteenmin_low;
var stock_open;
var stock_close;
var spy_open;
var spy_close;
var long_trade_setup = false;
var short_trade_setup = false;
var nstop;
var range;
var target;

function main() {
if (getCurrentBarIndex() == 0) return;

if(bInit == false) {
fifteenmin_high = 0;
fifteenmin_low = 0;
bInit = true;
}

var bExitFlag = false;
if (strtegy.isInTrade() == false) {
nStop = null;

}

if(getHour(0) ==0 && getMinute(0)==30){
fifteenmin_high = high(0);
fifteenmin_low = low(0);
range = fifteenmin_high - fifteenmin_low;

if( atr(5, inv("D"),-1) * 0.25 fifteenmin_high - fifteenmin_low) {
long_trade_setup = true;
short_trade_setup = true;

}
}

if( low(0) < fifteenmin_low)
long_trade_setup = false;
else if( high(0) > fifteenmin_high)
short_trade_setup = false;

return;
}
this is where i'm stuck and i have added StandardDeviation.efs as well.