Yes, you got them all! You must be a real comic book fan! There are more superheroes in both universes, the most popular from DC are Batman, Superman and Wonder Woman. The best known superheroes from Marvel are Captain America, Iron Man, Thor and many others.
Almost! It can be tricky, but once you have seen all the movies or read some of the comic books, you will be able to tell the difference. From the ones mentioned here Wolverine, Hulk and Spider-Man are from the Marvel universe and Superman, Flash and Aquaman live in the DC universe.