What is the meaning of "creation ex nihilo" (bringing into existence from nothing), and is Allah alone the Eternal and Everlasting in terms of the origin of general existence, and how can a Muslim become worthy of Allah's aid in all their affairs?

Allah existed, and there was nothing before Him. Then He created His creation after the universe was nonexistent. This is called ibdāʿ (innovation/creation ex nihilo) and fiṭr (originating/primordial creation). Among the means by which Allah assists His servant are: being keen on what Allah loves and assisting Muslims. This is achieved by adhering to the obligatory duties, then the supererogatory acts, and by showing kindness to people and relieving their distress. For Allah helps His servant as long as the servant helps his brother.