What was the first Walt Disney film he ever created in his lifetime?

Answer 1

Steam Boat Willie: It features the old version of Mickey Mouse, and a boat named Steam Boat Willie

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Wrong- Steamboat Willie was not even the first Mickey Mouse film, much less Disney's first animated film.

Prior to Mickey Mouse, Disney produced the Laugh-o-gram, Laflet and the Alice comedy series, and well over 100 animated shorts in those series.

The name of the first animated short is unknown. The Newman Laugh-O-gram series was Walt Disney's first film series. Short, typically only a minute long, these were entirely made by Disney. These were usually live-action with a limited bit of animation in them. These were produced for exclusive showings in Kansas City's Newman Theatres. They proved to be the stepping stone to the fully-animated and crewed Laugh-O-gram series.

The first known, named animated short from Disney was from the Laugh-O-gram series (NOT The Newman Laugh-O-grams), and was titled, Little Red Riding Hood.

Source: The Big Cartoon DataBase