One way to go about it is to pick a 'standard' filter pack as a starting point. If the paper box doesn't have one listed 50y 50m is a good place to start. Do a test strip and just aim for density; after you have nailed density make filter adjustments (if the image is really red add equal parts y&m, green subtract M and so on); as you get closer to the colour balance you are after you will find you may need to add or subtract time. After a few tests like this you'll get a properly balanced print. It could be that 0y, 0m will be a winner or 0m, 100y, 10c will be the winner -- with xprocessed films it is generally not a standard filter pack. I've never found the orange mask thing to be too helpful, but others have.