Congratulations on your new addition. I am no expert but have personal experience that works for me.
Take him or her out after meals, naps, before bed and when he or she first wakes up. Watch and you will learn your dogs signs that it needs to go. Heightened sniffing about, a sense of urgency or whining are some pretty easy signs. Also if you are gone for extended periods crate training is a good thing. Do some reading about the benefits and how to properly go about it. No matter how young or old, dogs are eager learners. Don't forget to praise him or her when they go outside. I mean really praise them even if you look the fool to bypassing eyes.