先: Formerly. Previously. Originally. Pioneer. What comes before in time or sequence, in contrast to "later."

亿: "亿万" refers to a number, specifically one hundred million (a "wan" being ten thousand, and "yi" being ten thousand times that), though in ancient times it denoted one hundred thousand. It generally signifies an immense quantity, symbolizing wealth and prosperity, and carries the implication of hoping to attain a life of glory, riches, and honor.