Not sure about the second part since I'm not sure what you're calling - that may need to be handled in the process - but waiting for the process to end is pretty simple.

Win32::Process::Create(
        my $process,
        'C:/path/to/executable.exe',
        "commandgoeshere",
        0,
        NORMAL_PRIORITY_CLASS,
        '.',
        ) or die "Could not start process\n";

# Wait for the process to complete before continuing in the applicatio
+n
$process->Wait(INFINITE); # You can also set a particular time
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