Your spelling of licence is a clue that you may not be in the US. While these are not considered firearms under US law, YOUR laws may be different. You will need to check with law enforcement staff where YOU are. Sorry that we could not give you a definite answer, but it might not be accurate for you.
Do you need a licence to own a blanks gun
Generally, no.
No, you do not.
no
A gun that looks real but only fires Blanks not real bullets.
A blank firing gun is completely legal in New York State, it is however illegal in New York City.
n0
No, you can own one.
You should be able to order from any gun store.
You don't need a gun license if you are 25 but if your under 25 you do need a gun license
Walther PPK, made famous by the early James Bond movies
You never need a license to have an Airsoft gun.
Not well, easily or safely in most cases. The blank gun is designed to NOT be easily convertible.