Newbie just tsrating, need help with a sketch

Projects Programming
50

so..I;ve been playing around, and this is where I;ve got so far;

The idea was to see if I could make it wait 5 seconds, then start the led sequence for 30seconds, then switch off the leds and repeat the cycle, so wait another 5 seconds and start the cycle, Im getting somehwere but i know ive got into a muddle with the timers and need some steering if possible :slight_smile:
Thank you!

const byte LedPins[5] = { 8, 9, 10, 11, 12};
unsigned long previousMillis;
unsigned long currentMillis = millis();
unsigned long previous30secondMillis;
int index = 0;
int updown = +1;      // +1 or -1 for going left and right
boolean doBlink;

void setup() 
{
 for( auto a:LedPins) 
    pinMode( a, OUTPUT);
}

void loop () 
{
  unsigned long currentMillis = millis();
  if( currentMillis - previousMillis >= 5000)  
  { doBlink = true;
  
  }

  if (doBlink) {
   unsigned long currentMillis = millis();

  if( currentMillis - previousMillis >= 80)
  {
    previousMillis = currentMillis;

    digitalWrite( LedPins[index], LOW);       // turn old led off
    index += updown;
    digitalWrite( LedPins[index], HIGH);      // turn new led on

    if( index <=0 || index >= 4)
      updown = -updown;
  }
  }

  if (doBlink && currentMillis - previous30secondMillis > 30000) { 
doBlink = false;

  }
    
  }