"Then Moses went back to Jethro his father-in-law and said to him, 'Let me go back to my own people in Egypt to see if any of them are still alive.' Jethro said, 'Go, and I wish you well.' Now the Lord had said to Moses in Midian, 'Go back to Egypt, for all the men who wanted to kill you are dead.' So Moses took his wife and sons, put them on a donkey and started back to Egypt. And he took the staff of God in his hand." NIV translation
Finally, Moses gave up his objections and decided to return to Egypt as the Lord had instructed him. He took his wife and sons on a donkey so we know that he had prospered in Midian. Armed with the staff of God, they set out. As Christians, we can walk with the power of God living in us through the Holy Spirit. Like Moses, we can come up with excuses and objections to the call of God upon our lives but, if our heart is right with Him, we will follow His will for our lives.
"The Lord said to Moses, 'When you return to Egypt, see that you perform before Pharaoh all the wonders I have given you the power to do. But I will harden his heart so that he will not let the people go. Then say to Pharaoh, "This is what the Lord says: Israel is my firstborn son, and I told you, 'Let my son go, so he may worship me.' But you refused to let him go; so I will kill your firstborn son."'" NIV translation
God gave Moses his final instructions which were basically a warning to complete all of the signs that were given to him.
We see that they were to be performed for the Pharaoh and not as some kind of show. (Today, there are many who want to put the power of God on display like a kind of circus show but that IS NOT God's desire.)
We also see that the Lord is going to harden Pharaoh's heart for His purposes and the result will be the plague on the firstborn sons.
"At a lodging place on the way, the Lord met Moses and was about to kill him. But Zipporah took a flint knife , cut off her son's foreskin and touched Moses' feet with it. 'Surely you are a bridegroom of blood to me,' she said. So the Lord let him alone. (At that time she said 'bridegroom of blood,' referring to circumcision.)" NIV translation
Along the way to Egypt, the wrath of God was about to break out against Moses. He had not circumcised his son as required under the Abrahamic covenant. This was the mark of the people of God and he was responsible for his son being circumcised. His wife stepped in and recognized what had to be done. In so doing, she saved the life of Moses. Today, many people try to minimize the role of a Godly woman/wife. As we see with Moses, it is crucial for a man of God to have a Godly wife. If Zipporah had not known about the things of God, Moses would have died.