PLease..I need help programming an RSI indicator

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i am trying to program an indicator in metatrader with not much luck because i know zilch about programming.I read an article on here on how too do this ,, but I am getting errors when i compile and I am not sure where to write in the sound alert itself,,and I also am not sure how to import the indicator and make it work into the program itself. so this is what I am trying to do ...I want a signal to alert me when RSI hits either level 55 from below or is coming down through level 45 .this is what i have so far can any one help..thank you in advance ..

//+------------------------------------------------------------------+
//|                                                    RSI ALERT.mq4 |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        https://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link      "https://www.metaquotes.net/"
 
#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_buffers 1
#property indicator_color1 DodgerBlue
//---- input parameters
extern int RSIPeriod=14;
//---- buffers
 
double RSIBuffer[];
double PosBuffer[];
double NegBuffer[];
//---- Íîìåð áàðà, ïî êîòîðîìó áóäåò èñêàòüñÿ ñèãíàë
#define SIGNAL_BAR 1
 
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string short_name;
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(3);
   SetIndexBuffer(1,PosBuffer);
   SetIndexBuffer(2,NegBuffer);
//---- indicator line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,RSIBuffer);
//---- name for DataWindow and indicator subwindow label
   short_name="RSI("+RSIPeriod+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
//----
   SetIndexDrawBegin(0,RSIPeriod);
//----
//---- Static variables where the last bar time
    //---- and the last alert direction are stored
    static int PrevSignal = 0, PrevTime = 0;
 
    //---- If the bar selected to be analyzed is not a zero bar, 
    //     there is no sense to check the alert
    //---- several times. If no new bar starts to be formed, quit.
    if(SIGNAL_BAR > 0 && Time[0] <= PrevTime ) 
        return(0);
    //---- Mark that this bar was checked
    PrevTime = Time[0];
 
// if(PrevSignal <= 0)
      {
        if(MainBuffer[SIGNAL_BAR] - 55.0 > 0 && 
           55.0 - MainBuffer[SIGNAL_BAR+1] >= 0)
          {
            PrevSignal = 1;
            Alert("Relative Strength Index(", Symbol(), ", ", Period(), ")  -  BUY!!!");
          }
      }
    if(PrevSignal >= 0)
      {
        if(45.0 - MainBuffer[SIGNAL_BAR] > 0 && 
           MainBuffer[SIGNAL_BAR+1] - 45.0 >= 0)
          {
            PrevSignal = -1;
            Alert("Relative Strenght Index (", Symbol(), ", ", Period(), ")  -  SELL!!!");
          }
      }
   return(0);
  }
//+------------------------------------------------------------------+
//| Relative Strength Index                                          |
//+------------------------------------------------------------------+
int start()
  {
   int    i,counted_bars=IndicatorCounted();
   double rel,negative,positive;
//----
   if(Bars<=RSIPeriod) return(0);
//---- initial zero
   if(counted_bars<1)
      for(i=1;i<=RSIPeriod;i++) RSIBuffer[Bars-i]=0.0;
//----
   i=Bars-RSIPeriod-1;
   if(counted_bars>=RSIPeriod) i=Bars-counted_bars-1;
   while(i>=0)
     {
      double sumn=0.0,sump=0.0;
      if(i==Bars-RSIPeriod-1)
        {
         int k=Bars-2;
         //---- initial accumulation
         while(k>=i)
           {
            rel=Close[k]-Close[k+1];
            if(rel>0) sump+=rel;
            else      sumn-=rel;
            k--;
           }
         positive=sump/RSIPeriod;
         negative=sumn/RSIPeriod;
        }
      else
        {
         //---- smoothed moving average
         rel=Close[i]-Close[i+1];
         if(rel>0) sump=rel;
         else      sumn=-rel;
         positive=(PosBuffer[i+1]*(RSIPeriod-1)+sump)/RSIPeriod;
         negative=(NegBuffer[i+1]*(RSIPeriod-1)+sumn)/RSIPeriod;
        }
      PosBuffer[i]=positive;
      NegBuffer[i]=negative;
      if(negative==0.0) RSIBuffer[i]=0.0;
      else RSIBuffer[i]=100.0-100.0/(1+positive/negative);
      i--;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
//----
   
//----
   return(0);
  }
//+---------------------------------------------------------------
 
Why wouldn't the standard RSI indicator work for you? Why are you reinventing the wheel?
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