Welcome to the forum,
You will need to take your puppy outside after sleeps and after eating, say something like "do your business" or whatever you feel comfortable to say. And after a while your puppy will learn that when you say that it is time to "do their business". Make sure that your puppy is supervised when indoors, so if you see him/her starting to go toilet you can take him/her outside and repeat your go toilet words.
You will want to ensure that you are consistent in your training.
Hope to see pictures soon.