For travelling to Turkey you must have a valid passport (6 months’ validity at entry) and depending on your nationality a visa. Check www.evisa.gov.tr to see whether you require one.
For women: always take something with you (i.e. a shawl) to cover your head when visiting mosques. You don’t need to wear one on the street, but dress properly.
Turkey is one of the most popular tourist destinations in Europe, so there are many tour operators that you can check out to find a trip to your liking and budget.
See also the official website for Turkey.