You have asked two entirely separate questions, the latter of which is not historical in nature. The former question regarding life in Spain after the Muslim Umayyad conquest in 711, I can answer that it encompassed several periods of remarkable peaceful coexistence between Christians, Jews and Muslims. Keep in mind that Muslim rule in Hispania lasted over 700 years - it was more than just an 'occupation' - and the conditions would have varied significantly over that time span. However, the general view is that it was a period of exceptional tolerance for various ethnic and religious groups, and is referred to as La Convivencia. There is some debate about what tolerance really meant, and I hope that we will get more answers on this post. But it is a fact that for several centuries both Jews and Christians took part in the royal courts, and were fully integrated into the intellectual life, particularly in Cordoba. A great deal of ancient classic writing survived because of la convivencia - Greek writings were translated into Arabic, Hebrew, Latin, and vice versa. I may check back later to give some more detail. There are actually many surviving firsthand documents from Christians, Jews and Muslims from throughout this period so if you don't get any detailed authoritative answers on this thread, here are two books that will definitely shed light on this:
1: https://www.amazon.com/gp/product/0812215699/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
and also 2: https://www.amazon.com/Ornament-World-Christians-Tolerance-Medieval/dp/0316168718
-pars
You can hardly speak of "spanish" before 711 AD though, a better question would be what life in Islamic Iberian realms was like, are you particularly interested in what life was like for Christians?
Also the period of islamic rule lasted for nearly 8 centuries, it was extremely long and conditions varied greatly depending on location within the Iberian peninsula and date. Maybe you should specify that too?
Last but not least, the impact of of that period in Spanish culture was immense, and is being a bit downplayed up to this day: here's a declaration from a representative of the Spanish royal Academy
Ill try and come back later to give a more complete answer, with better sources and a more in depth view
Edit: Link doesnt seem to work, heres the name and info on this work
La investigación de los arabismos del castellano en registros normales, folklóricos y bajos REAL ACADEMIA ESPAÑOLA DISCURSO LEÍDO EL DÍA 20 DE MAYO DE 2018 EN SU RECEPCIÓN PÚBLICA POR EL EXCMO. SR. D. FEDERICO CORRIENTE Y CONTESTACIÓN DEL EXCMO. SR. D. JUAN GIL