can my 18 year old get into the club without a guardian and his friend

Only if his friend is over 18.. If he is, they can get in, but they must have a wristband which the door person will provide..

Yes he can enter, even if he's a minor

Yes, anybody over 18yo. Now, at the entrance security should place a wristband to know NOT TO SERVE OR SEE drinking alcohol..

Is the friend under 18?