Virtues of some surahs and ayahs and beneficial supplications.

Prayer is the key to Allah's mercy, hence commence All your work with prayer, whoever it please that Allah may respond to his call (prayer) during the time of hardship and distress, let such person engage himself in supplication during the time of prosperity and happiness, he should also be constantly seeking Allah's benediction(As-salat) on the holy prophet (sallallahu alaihi wa sallam) certainly, Allah will suffice him in his worldly affairs and that of the hereafter.

Almighty Allah has directed us to make earnest entreaties to him or call on him for the fulfillment of our needs, and The holy quran assures is that Almighty Allah is very close to his servants and he listens to their petitions and grants them.
The holy Qur'an says:
"Call on me, I will answer (your prayer)" (40:60)

Out of Allah's mercy shown to his servants, he taught them how to supplicants him, worship him and what to beg for.