What are the airport rules?

Here is the deal. I have not been on a plane for 10 years and that was a domestic flight. I am planning a trip to Cario, Egypt by December. Yes I know what a perfect month to go the most busy month of flying. Okay my questions are: What is the best way of planning a trip like this? What are the rules of the Airport? Please add websites if you know any! What are the baggage weights? Where to find the best airfare tickets for a international flight? Please feel free to add advice of handleing a long flight with a almost 2 year old child. Please give the best awnsers that will make this trip as much stress-free as possible thank you