Memorising qur'aan and learning Arabic takes time (but do do it as per the brother's advice). Learning Arabic is really important to learn your deen. But alongside, do study some aqeedah in English before then, using reliable sources. I do know some huffaadh (people who have memorised Qur'an) who's aqeedah is not according to the sunnah!
A really good book to start off with is The Fundamentals of Tawheed, by Dr Abu Ameenah Bilal Philips, as tawheed is the basis of Islam, on which all the other pillars and principles depend. The concept of Tawheed is quite profound, and needs to be understood properly, in the way that it was taught by the Prophet sallallaahu alaihi wa sallam and understood by his companions (radiallaahu anhum ajma'een).