Turn that 'go thorugh' option. Not sure what it was called. I think either Phasing or Transparent or somthing.
1) Also, to make a flying thing just take your character set.
2) draw a shadow underneth (depending on the hieght draw it lower or higher)
3) Use 'Cut' and drag each sprite in diffrent positions to make a floating effect.
Though that how id do it, but im not much of an artist. Go on the resource forums.