Signs follow preaching
Mark 16:19 So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God.
Paul gives us another account of what Jesus did.
1 Cor 15:3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
1 Cor 15:4 And that he was buried, and that he rose again the third day according to the scriptures:
1 Cor 15:5 And that he was seen of Cephas, then of the twelve:
1 Cor 15:6 After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep.
1 Cor 15:7 After that, he was seen of James; then of all the apostles.
1 Cor 15:8 And last of all he was seen of me also, as of one born out of due time.
Read the accounts in the other gospels for more details. Luke describes his departure in the book of Acts.
Acts 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Acts 1:9 And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight.
Acts 1:10 And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel;
Acts 1:11 Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
After Pentecost, they had the boldness of the Holy Spirit to preach the gospel. The Holy Spirit is truth, peace and love.
1 John 4:18 There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.
Fearlessly they went forth.
Mark 16:20 And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
First the word of God, with signs following in confirmation. Let us not be a ministry seeking signs alone. We must preach the word. We are not show business to entertain, but servants. The Lord will build His church.