The disciples on the evening of the first Easter were in a locked room.  But who or what were the disciples afraid of?

Chiefly they were afraid of the Jews.

Source: John 20:19

In the gospel of John , when Mary reported the angels also that Jesus had risen. Some apostles ran to the tomb to see for themselves?

Two disciples ran to the tomb. Peter and also the disciple Jesus loved (John). They then saw the proof of the resurrection.

Source:

John 20:3-9

Jesus appeared many times when he rose from the dead.  Where did Jesus appear to the apostles in Galilee?

Jesus appeared to them by the Sea of Tiberius.

Source:

John 21:1-14

In the Gospel of Mark where did the angel tell the women to meet the risen Jesus later?

The angel told the women they would meet Jesus in Galilee.

Source:

Mark 16:7

The Roman guard told the Pharisees that Jesus rose. What did the Jewish leaders then tell them to do?

They bribed them and also told them to say they fell asleep and his disciples stole the body. The guard was nervous because sleeping on guard duty was a serious crime. The Jews promised to keep them out of trouble for it.

Source:

Matthew 28:11-15