Newbie Coder--Trying to code in a trailing stop loss--somewhat lost

Hey, so this is what I have so far:

void OnTick(void)
  {
  openedpositions=OrdersTotal();
   if ((openedpositions > 0)) 
      { 
   int totalorders = OrdersTotal();
      for(int i=0;i<totalorders;i++) // scan all orders and positions. ..
      {
      OrderSelect(i, SELECT_BY_POS);
   if ( OrderSymbol()==Symbol() && OrderMagicNumber() == uniqueGridMagic) // only look if mygrid and symbol. ..
      { 
         int type = OrderType();
  if(OrderType()==OP_BUY)
            {
               if (Bid-OrderOpenPrice()>TrailingStop*Point && OrderStopLoss()<Bid-TrailingStop*Point)
               {
                  OrderModify(OrderTicket(),OrderOpenPrice(),Bid-TrailingStop*Point,0,0,Green);
               }   
            }
            
            if(OrderType()==OP_SELL) 
            {
               if(OrderOpenPrice()-Ask>TrailingStop*Point && OrderStopLoss()>Ask+TrailingStop*Point)
              {
                  OrderModify(OrderTicket(),OrderOpenPrice(),Ask+TrailingStop*Point,0,0, Red);
              }           
           }
           }
           }
           }
}

Basically, I'm trying to have it scan all open orders every tick and modify them, if they have not been modified already, like this:

1. start with static stoploss of 25 pips

2. at 5 pips profit move stoploss to entry price

3. at 8 pips profit move stoploss 4 pips behind 8 pips profit (current price)

So I think I have it able to scan all orders, correct me if Im doing it wrong, but I am totally lost on how to incorporate the stop loss like so. Any ideas guys? Much appreciated