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I'm a complete noob when it comes to Tyranids so I want to ask this.

The Hive mind. Is it a powerful being who controls the Tyranids with it's mind? Or do all Tyranids share the same mind instead of just one being controlling them all?

From the wiki:

The Hive Mind is the gestalt collective consciousness of the entire Tyranid race, a psychic embodiment of the Tyranid instincts and racial imperatives to devour and destroy.

It is not a single mind capable of small, conscious thought the way a Human's mind works, but instead it is a grand agglomeration created from the psychic presence of untold billions of Tyranid creatures. It is a nightmarish and unfathomable intelligence that allows Tyranids to coordinate and adapt as if every Tyranid creature is merely a part of a single massive organism, one which is utterly focused on consuming all other life.

Amoras wrote:
From the wiki:

The Hive Mind is the gestalt collective consciousness of the entire Tyranid race, a psychic embodiment of the Tyranid instincts and racial imperatives to devour and destroy.

It is not a single mind capable of small, conscious thought the way a Human's mind works, but instead it is a grand agglomeration created from the psychic presence of untold billions of Tyranid creatures. It is a nightmarish and unfathomable intelligence that allows Tyranids to coordinate and adapt as if every Tyranid creature is merely a part of a single massive organism, one which is utterly focused on consuming all other life.

So in layman's terms, his second guess.

Thanks Amoras.