Everyone gave you really great advice on what to get for your new pup! I just want to add in regards to you being his "master", yes he will definitely be super attached to you, BUT I started dating my boyfriend when Oliver was around 5 months old. He comes over pretty much everyday and, even though I'm his caregiver, Ollie is SOOO attached to my BF...sometimes more than myself!! So with your girls being around him a lot he will become just as attached to them, don't you worry! Yorkies crave human contact and love to be close to the people they see on a daily basis, I don't think you'll have a problem at all
Good luck and can't wait to see pics!!