I read a lot of the Aliens novels when I was in middle school. The ones from the 90's were all based on comic book series' spun off from the movies. Earth Hive is a good place to start. It's based on the original Dark Horse Comics series simply titled "Aliens," which was originally meant to be a direct sequel to the film Aliens before Alien3 came around. Earth Hive, Nightmare Asylum, and The Female War are a trilogy which follow Wilks (Hicks) and Billie (Newt) on a series of adventur
Great input on the alien books, thanks!