Have you ever gone travelling around the world? Some advice & tips please.?

I am planning to go to Portugal Spain and then to Turkey from London (where I live). I am planning to spend one week in each country. But what I wanna know is how do I book flights for each country? Because I wanna go to Portugal Lisbon first and then go to Madrid, Spain and then from there go to Istanbul, Turkey.... show more I am planning to go to Portugal Spain and then to Turkey from London (where I live). I am planning to spend one week in each country. But what I wanna know is how do I book flights for each country? Because I wanna go to Portugal Lisbon first and then go to Madrid, Spain and then from there go to Istanbul, Turkey.

So how do I book a flight ticket for each place?
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