Just add the my statement infront of a variable the first time you use it.

I.E.
my $var1 = "FOO"; #Now its declared.
my $var2;

#Now you can do whatever you want to it.  

$var2 = "BAR";
$var1 = $var1 . " " . $var2;
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Or something like that. You get the picture don't you. All the best, Eoin...