Rose City Comic Con

I have never been to that convention specifically so I am not sure how large or small it is, but the advice you will hear the most regarding conventions is this:

1)WEAR COMFORTABLE SHOES. You are walking around all day long, most likely on concrete or a carpet that is 1/16" thick, your body will thank you later.
2)Bring a water bottle/snacks. Convention food and beverages are usually overpriced (in my case almost never vegan-friendly), and the lines are insane. This is very important if you or your son have any form of food intolerance or allergy.
3A)Plan accordingly. Assuming there are specific creators you want to meet/get books signed by/check in a panel then you should look them up via social media beforehand and get a feel for their schedule. You can also usually view the panel schedule ahead of time as well. You want to prioritize.
3B)Check out the floor map ahead of time.
4)Browse before you purchase. I know you will see some killer deals on books/toys/whatever as soon as you walk through the door, but there may be even sweeter bargains waiting around the corner. Budget that money because you will be spending it a lot quicker than intended.
5)Be patient and have fun! It is an obvious piece of advice, but it is quite easy to succumb to feeling anxious while attending a convention. People tend to congregate in aisles; cosplayers will randomly stop to take pictures with people spur of the moment. These are things that happen, and as frustrating as it may be, you have to just roll with it. It is all part of the experience.

Hope you have a great convention experience!