Konjak, just set everything you want for the created objects on the action line right after the create/spawn action. Actions directly after a create/spawn action will pick the newly created one, and perform the actions on it.
eg.
create bloodpixels at kid.x, kid.y
.bloodpixels set height to 2
.bloodpixels set width to .height
.bloodpixels set value 'speed' to 2
.bloodpixels set animation frame to 3
any actions after the spawn/create event will affect the newly created object.
And what about destroying? I don't get what you mean about that.