Potty training is the focus of every puppy owner. Some pups take only a few days or weeks, and some take as long as a few months. I've even heard of some people that were never able to potty train their pups.
Thankfully Marou is absolutely repulsed by his own waste, so potty training was as simple as taking him outside when he showed any signs of needing to relieve himself. Save for a few incidents and some extenuating circumstances, he doesn't relieve himself inside at all.
The first step was to acquaint Marou with his harness and show him that it was not bad or scary. This was simple: we just fed him a few pieces of kibble or training treats that we had on hand as we put his harness on him. Getting accustomed to it took him a little while, but now he wears it like a natural.
Next, we showed him where the door was and taught him that it leads to outside (where he should relieve himself). This was accomplished by many short trips outside when there was any suspicion that he had to go. He caught on fairly quickly and began to sit by the door when he needed to go. If he needed to get our attention he would paw the door or "speak" to us until we acknowledged him.
Josie did an amazing job teaching him where the door is and how to show us that he wants to go outside.
He's by no means a model citizen, but his compliance with the training has made life so much more pleasant and a whole lot easier.