G'day MoniqueLT,

You've received good advice on writing a subroutine; however, I noticed you actually wrote: "... I would like to make a method ...".

If you want to code:

$object->method_name($param1, $param2, $param3);
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Then your subroutine definition will typically look more like this:

sub method_name {
    my ($self, $param1, $param2, $param3) = @_;
    ...
}
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See "perlootut - Object-Oriented Programming in Perl Tutorial" for a general discussion and the Methods section for specifics.