There is no rule that says you have to watch the Marvel Movies in a specific order. You can watch them all at whatever pace works for you. For example, if you are one of those people who would rather just sit back and relax and watch Marvel movies then there is nothing wrong with that. The point here is that you will want to be able to enjoy the movies as they come out and to be able to learn about the characters and their backgrounds.
It is really best to start with one of the newest movies. This will give you a good overview of what the movie is about and what the storyline is. Some people like to try and guess what is going to happen in the movie and these are the people who should wait for the first movie to come out before watching the others. Also, it is often hard to make heads or tails of the plot lines in the first movie. Instead, wait for the second movie and let the second movie put the plot lines together. Then you can go back and see if you got it right.
Some other ways to go about getting to know the story and the characters of the Marvel Movies is to read the comic books. Also, when it comes to watching movies it is also good to watch the trailers to see what each of the characters is going to do and how they are going to act in each scene. You can also look up any background information you may need on the different characters. This way you will be able to give them all names and then you will be able to identify who they are. This way you will know what you are getting into and will be better prepared to watch the movies.