Can Somebody Please Tell Me The Procedure

GOODDAY NAIRALANDERS,
                                            CAN SOMEBODY PLEASE TELL ME THE PROCEDURE OF GOING ABROAD BECAUSE MY FRIEND HIS INVITING ME OVER AND HE SAID I SHOULD TELL HIM ALL THE NECESSARY THINGS THAT I NEED, PLEASE IT IS URGENT.  You CAN FORWARD THE DETAIL TO ME,

It depends on what country, try and google the country's embassy or state's office for information for the kind of visa you will need, then you can tell your friend. Good luck