It's important to travel with a valid passport or identity card. Please be aware that some countries require several months validity from the time you enter the country to the time you leave. Check your travel documents.
It all depends on your destination. Please check that you have valid Visa (if applicable) to enter final destination country.
Useful link: http://www.iatatravelcentre.com
Pack your luggage, including your Hand-Carried Luggage, according to security guidelines and airline’s policy.
Every airline has rules about its maximum baggage weight. The weight should be stated on your ticket.