After or al0ong side (is best) read the Hadiths and Sunnahs from these authorized holy books to understand what is meant in the sura you just read:Talibari, Muslim, Isaq and Bukhari. Otherwise, you are just guessing; the koran is not like the Bible as it takes four other books to understand what the first says.
My suggesstion would be if you don't want to read all the Hadiths , I would first read Bukhari, and then read Muslim, and you certainly would understand the fundamentals of Islam.
In line with this thread I would recommend reading William J Federers book - "What every American needs to know about the Koran" -Tom
Twice already. Once long ago while in school. Once last year.
The Koran is difficult to keep reading to the end because it is so damned repetitious. It could be condensed into a hundred or fewer pages pretty easily, maybe 50.