"And God said, 'I will be with you. And this will be the sign to you that it is I who have sent you: When you have brought the people out of Egypt, you will worship God on this mountain.'" NIV translation
God's answer to Moses' objection is patient and loving as He reminds Moses that He will be with them. God also gives him encouragement as He says that they will make it and will come to that mountain to worship God. We, who are in Christ, have the same assurance that He is with us and whatever He gives us to do will be successful.
Moses' next objection is simply that he might not have all of the answers. The same objection is used by many believers in giving a reason for not sharing their faith.
"God said to Moses, 'I AM WHO I AM. This is what you are to say to the Israelites: "I AM has sent me to you."' God also said to Moses, 'Say to the Israelites, "The Lord, the God of your fathers - the God of Abraham, the God of Isaac and the God of Jacob - has sent me to you." This is my name forever, the name by which I am to be remembered from generation to generation.'" NIV translation
Once again, God answered Moses' objection and gave him the words that he would need. In the name given (I AM), we are reminded of the fact that God is the foundation of all things as He created everything in the beginning. God told him (and us) to remember that name because it is the basis for everything else. To come to God, we must first acknowledge Him as the eternal Creator because that is the basis for His authority.
"'Go, assemble the elders of Israel and say to them, "The Lord, the God of your fathers - The God of Abraham, Isaac and Jacob - appeared to me and said: I have watched over you and have seen what has been done to you in Egypt. And I have promised to bring you up out of your misery in Egypt into the land of the Canaanites, Hittites, Amorites, Perizzites, Hivites and Jebusites - a land flowing with milk and honey."'" NIV translation
The first step for Moses was to speak to the leaders of the Israelites. He was to reassure them that God was watching over them and to tell them of His promise for them.