A general rule of thumb for checked luggage is that the bag be no more than 62 linear inches (sum of L+W+H) and 50 pounds. Airlines do impose fees for oversize and/or overweight bags, for which you will be responsible. Airlines currently do not charge a fee for the first checked bag on international flights. Once your flight is confirmed, please check the airline website for specific details on checked baggage.
Your carry-on bag should be the size of a school backpack and fit under the seat in front of you or in the overhead bin. All liquids or gels in your carry-on bag must be in three ounce size containers (or smaller) and placed in a clear quart-size zip-top bag. All medications must be carried in original containers.