First, find out the specifics for the country or countries you are traveling to. Each country has its own requirements. Make sure you understand their requirements and start getting your documents in order as soon as you can. Things do get lost in the mail and you need plenty of time in case that happens to you.
Traveling abroad can require a long flight. Comfort is the next thing you need to think about.
Bring a travel neck pillow and blanket. Maybe some earplugs and an eye mask.
Don’t forget each country has different entry requirements. So make sure you get your immunization shots. Also make sure you check around for your exchange. You might not be able to use credit cards or ATM cards. If you are a big shopper don’t forget to bring an extra bag or luggage. Those fold down travel duffel bags are a great idea.