Apologies, I should have been a bit more constructive here. Anyway, if I had to model a helicopter, I'd go for something like this:
I made this in about 15 minutes, so there's plenty of stuff to tweak here. But I do think that it looks like it could fly.
As Sybixsus said, you should use some reference when creating a model, especially when you've never done a model like that before. Think about the basic shapes. Think about the purpose of the thing (to fly, so you don't want to make it look like a brick). Get some images. For this image I used an image of a Apache and a regular chopper, just so I'd know where the basic parts go and a rough sense of proportion.
Good luck!
I made this in about 15 minutes, so there's plenty of stuff to tweak here. But I do think that it looks like it could fly.
As Sybixsus said, you should use some reference when creating a model, especially when you've never done a model like that before. Think about the basic shapes. Think about the purpose of the thing (to fly, so you don't want to make it look like a brick). Get some images. For this image I used an image of a Apache and a regular chopper, just so I'd know where the basic parts go and a rough sense of proportion.
Good luck!