The answer to this really depends on what type of module you are writing. For object-oriented modules, passing information to the module usually happens when you first create the object:

my $foo = new Foo("bar");

package Foo;
sub new {
    my $class = shift;
    my $var = shift;
    bless \$var, $class;
}
[download]

Otherwise, it is usual to provide both an import() interface and a variable in the namespace of the module in case the value needs to be changed after the module is first included:

---------(In Foo.pm)------------------
package Foo;
sub import {
    $Foo::var = shift;
}
---------(In a different file)--------
use Foo qw(bar);  # Sets $Foo::var to "bar"
#...
$Foo::var = "baz"; # Changes $Foo::var to "baz"
[download]

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