It was alphabetic, and was adapted by the Greeks and Romans, and so was the basis for today's alphabets.
Yes they did have a system of writing
A writing system is a system for writing a language or group of languages, for example, the Latin or Cyrillic alphabets.
They had no writing system, but they kept many records of their writing.
there writing system was cuneiform
The Phoenicians developed their writing system from the Sumerian writing system in 1400 BCE, so their writing system came after the Sumerian one.
The Sumerian writing system is called Sumerian cuneiform. The writing was known as the earliest writing system that was traced back in 8,000 BC.
a writing system
The Egyptians developed a hieroglyphic writing system.
The name of the greek writing system is Cuniform.
No, Korean does not use kanji in its writing system. Korean uses a unique writing system called Hangul, which was created in the 15th century. Kanji is a system of writing characters borrowed from Chinese used in Japanese writing.
Meroitic writing
Because it was the first writing system in human history.