Hello IISGUY,
A few suggestions in addition to what's been said:

1. Check out perlsyn in the Perl documentation. You should get in the habit of adding the following to the top of your scripts:
   

   use strict;
   use warnings;
   use diagnostics;
   use Data::Dumper;
   [download]

   The first two pragmas (use strict; use warnings) are *musts. The second two items *(use diagnostics; use Data::Dumper;) will give you additional information on any errors your script may be returning.
   
   
2. Declare your variables (you will get an error if you do not add my):

   my $num1=$ARGV[0];
   my $num2=$ARGV[1];
   [download]

3. Everyone has their own approach to solving a problem but why not be direct and test for the correct answer first instead of testing for incorrect input. Here's one pseudo-ish approach:
   

   # 1
   # Ask the user for two numbers
   
   # 2
   # while the first number is less than the second;
       # add 1 to the first number
       # then print out the second
   
   #^# THAT'S THE CONDITION YOU WANT #^#
   
   #3 
   #v# NOW DESCRIBE WHAT CAN GO WRONG AND WHAT TO DO ABOUT IT #v#
   
   # if the user enters less than two numbers
       # say to the user: "you didn't give me two numbers"
   
   # if the user enters more than two numbers
       # say to the user: "you gave me too many numbers
   [download]

I hope this helps. Good luck!