I’ll let others handle the fears. Posters- feel free to correct me.
Definitely do the online check in- can be done within 24 hours of your flight so do it as soon as you can. Print out your boarding passes as well. I’m old fashioned and don’t have things on my cell phone- if you are more tech savvy you can have it on that. We also did the checked bags payment but you still have to get in line to check them in.
Plan more time than you think you need- the two hours ahead of flight time once you get to the terminal. Allow time for parking, getting to the terminal. It depends on whether you have someone drop you off, the size of your airport, how far parking is… Sometimes the lot has a shuttle which may not come for 5-10 minutes.
Once at the airline terminal there are kiosks for check in but if you did it at home you’re okay. I do recall using the kiosk for paying for bag check in. Check in your bag (look up how many for how much- most charge for the first bag and we divide up weight- do not go over 50 pounds- this is where having a light bag helps). We often take one checked bag for both of us.
Check the rules for carryon sizes and items. If you take water you have to buy it after security- or take an empty bottle you fill there. That 3 ounce rule applies. This means toothpaste and all other gels/liquids. Buy those sizes at Target/Walmart and pack the big size in your checked bag. Put stuff in those qt sized bags you likely already own. They haven’t always checked ours, but… Do realize they will confiscate Swiss army knives, other stuff you may keep in your purse.
We take our old carry on soft bags that we can stuff under the seat. Rolling bags may be too big for carry on- check your sizes. So many people avoid checked bags there often is not enough room for everyone’s in the overhead bins and they do free checking at the gate. I like having access to stuff without needing to get up and get my bag.
Wear regular shoes- not sandals or heels. Long pants and bring a sweater/jacket for wearing on the plane. You can take a purse along with your carryon- you might want to stuff yours if small into a larger tote so you can have your e-reader/i-pad, books, snacks et al handy under your seat. Be prepared to take off metals- watches, belts et al. Therefore do not wear l a lot of jewelry as well.
Look at the paid food menu to see if you want to buy anything or else take your own food. Many buy at the airport or bring from home. Still free beverages. I have asked for the whole can of soda since the ice in a cup takes up so much volume.
I figure out the timing and use the airplane restroom before likely can’t as well as just before boarding. They changed boarding order years ago- each ticket given a zone and it is not logical. Instead of boarding back to front they mix it up so you wait in the aisle for people to store their stuff overhead.
The good news- absolutely no smoking in the airplane or terminal. You can likely go online and change your assigned seats anytime if you don’t like what your son presumably booked. Get through security to your gate as soon as you can. Park yourselves and let one watch your carry on baggage while the other explores nearby.
Do not pack electronics in checked bags. Look at new rules for batteries in electronics- some devices have caused fires this past year or so. Remember to pack cords and chargers. Set devices to airplane mode once on the plane (remember to undo after you land). I take an extension cord (3 prong) because many hotels we stay at have few/inconvenient outlets- this can go in checked bag. It might help at a house as well.
Have your passport (up to date of course) ready. Check online to see if your state driver’s license complies with the most recent rules- some don’t.
This all sounds complicated but if you go through things at home it will be fairly easy.
Enjoy your trip!