Here is what i found, hope it helps
Intro:
The Moors ruled Sicily for two centuries and a few decades but their influence was nothing short of monumental. Under their administration, the island's population doubled as dozens of towns were founded and cities repopulated. The Arabs changed Sicilian agriculture and cuisine. Their scientific and engineering achievements were remarkable. More significantly, they changed society itself. To this day, many Sicilian social attitudes reflect the profound influence --often in subtle ways-- of the Arabs who ruled a thousand years ago but who (with the Greeks and others) are the ancestors of today's Sicilians.
The Arabs introduced superior irrigation systems; some of their qanats (channels) still flow under Palermo. They established the Sicilian silk industry, and at the court of the Norman monarch Roger II great Arab thinkers like the geographer Abdullah al Idrisi were welcome. Agriculture became more varied and more efficient, with the widespread introduction of rice, sugar cane, cotton and oranges. This, in turn, influenced Sicilian cuisine. Many of the most popular Sicilian foods trace their origins to the Arab period.
900 to 1150:
Dozens of towns were founded or resettled during the Saracen era, and souks (suks, or street markets) became more common than before. Bal'harm (Palermo) was repopulated and became one of the largest Arab cities after Baghdad and Cordoba (Cordova), and one of the most beautiful. Construction on Bal'harm's al-Khalesa district built near the sea was begun in 937 by Khalid Ibn Ishaq, who was then Governor of Sicily. Despite later estimates of a greater population, there were probably about two hundred thousand residents in and around this city by 1050, and it was the capital of Saracen Sicily. Bal'harm was the official residence of the Governors and Emirs of All Sicily, and al-Khalesa (now the Kalsa district) was its administrative center. As we've mentioned, in 948 the Fatimids granted a degree of autonomy to the Kalbid dynasty, whose last "governor" (effectively a hereditary emir), Hasan II (or Al-Samsan), ruled until 1053. By then, Kasyr Yanni (Enna), Trapani, Taormina and Syracuse were also self-declared, localized "emirates." (This word was sometimes used rather loosely to describe any hereditary ruler of a large locality; in law Sicily had been a unified emirate governed from Palermo since 948, but by the 1050s the others had challenged his authority over them.)
Byzantium hadn't forgotten Sicily, and in 1040 George Maniakes, at the head of an army of Byzantine-Greeks, Normans, Vikings and Lombards, attempted an invasion of Sicily without success. By the 1050s, the Pope, and some Norman knights from this failed adventure, were casting a long glance toward Sicily with an eye to conquest. This desire was later fueled by dissension among the island's Arabs, leading to support by the Emir of Syracuse for the Normans against the emirates of Enna and North meets South and East meets West in Palermo in 1148. Tomb inscriptions in Latin, Greek, Hebrew and Arabic.Palermo. Most of these internal problems developed after the ruling Fatimids moved their capital from Tunisia to Egypt, where they established Cairo (near ancient Memphis).
Also the Saracens had very strong archers, and the Sultanate of Sicilia did had control over all sicily for 2 centuries and a half, until they became divided into 3 Emirates, then the Normans came and found them easy prays, I don't khow why Saracens always get divided but that's the same reason they got pushed out of Iberia.
Anyway i'm from Morocco and i khow more about Andalous(Moorish Iberia) than about the Emirate of Sicily because i have Andalusian roots myself
Good luck with the mod my friend!