In order to introduce your animals to each other you must put in a little forward planning, but its okay you have already done it just start again. This guide is a step by step easy to follow write up so make sure you know what you are doing before beginning.
Try http://www.teachingpuppies.com/how-to-introduce-a-new-puppy-to-your-other-pets
If your dog suffers from dog aggression you will want to deal with this http://www.teachingpuppies.com/how-to-deal-with-dog-to-dog-aggression
You should also teach your puppy the รยขรขโยฌรลleave itรยขรขโยฌรขโยข command this is not only for objects but also helps them control their bite inhibition (become more aware of how people and other animals like to be interacted with). This will show you how (its really easy) http://www.teachingpuppies.com/how-to-teach-my-puppy-to-leave-it