I know everyone wants Ant-man and Wasp in the avengers but they have had no lead up whatsoever in the previous marvel films. While i was thinking about it the other day i came up with an idea of how marvel could introduce ant-man and wasp. personally i think that they should not include them in the first Avengers film because then it would feel too congested with Hulk, Iron man, Thor, Captain Aamerica, Black Widow and Nick Fury. I think that the first film should be about those characters working together and getting over their differnces to really come through in the end as a team.
Back to the point, I think that at the end of the avengers they have Hank and Jan come to tony's house with an appointment with him. but he would be with Nick Fury or something and had forgot about the meeting. And then when they come in they tell tony that they were supposed to showcase their invention at the stark expo, When the incident with Justin Hammer happened and they never got to show their idea. They then demonstarte their invention (Shrinking themselves and the wings/ant talky-thingy) in front of Tony and Nick Fury, who are impressed by the inventions. Nick and Tony then exchange glances (or something like that, that would show that they are considering them for the Avengers anitiative).
Then in the second avengers movie (if they are included). Would make the team consist of seven avengers (- hulk, he was never a long standing member) and then there is the possibility of Hawkeye and vision which would make nine superheroes in the one movie, and even though thats a lot of characters i think that they could make it work.
Well thats just my idea. If anyone else has any ideas on how to introduce the two characters make sure to leave it in the comments section.
p.s. in the comments, go kind on me, its my first article :)