Hello Sarah, and welcome! First things first, there is no such thing as a "starting point" for the Camino. Ideally it's when you step out of your front door, and some are still able to do it, but for those of us across the pond, not so easy ;0) I have a local "Friends" assocation and it gives out credenciales and stamps them for us - so it's like starting from home. Perhaps you can look for something similar in your area.
I know that the Ponferrada bus station has arrows in its parking lot showing the way to the albergue, perhaps the bus station also does. If it does, follow the arrows and have your credencial stamped once you get there - they may even have them on site for sale. You will be tired, but do take some time to at least take a look at the Templar Castle, it will make you feel as if you are a kid again, or a caracter in a Disney princess movie.
As for other "etiquette" issues: just be mindful of people napping when you arrive, try not to barge in despite of all the weight you'll be carrying on your back. Showers should be short and sweet, and backpacks, bags and stuff not impeeding circulation. Plastic grocery stores are not your friend, because they are loud and will wake others up. Snoring is allowed ;0)