Once your iquama is issued, this takes probably around 2 weeks from the date you arrive; you can then get the family visit visa's issued, this will take between 2 weeks and 2 months.
I recommend though that once you have your iquama that you directly get your family their residence permits i.e. their iquama's. This takes a little over 2 months because you have to wait for the company to do an interview for you.