Here are a few questions and answers that come from Martin Luther, from whom the Lutheran church gets its name. He was a 16th century monk and priest and professor. Here's how he described baptism in his "Small Catechism":
Q: What is baptism?
A: Baptism is not simply plain water. Instead, it is water used according to God's command and connected with God's word.
Q: What then is this word of God?
A: Where our Lord Christ says in Matthew 28, "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit."
Q: What gifts or benefits does baptism grant?
A: It brings about forgiveness of sins, redeems from death and the devil, and gives eternal salvation to all who believe it, as the words and promise of God declare.
Q: What are these words and promise of God?
A: Where our Lord Christ says in Mark 16, "The one who believes and is baptized will be saved; but the one who does not believe will be condemned."
Q: How can water do such great things?
A: Clearly the water does not do it, but the word of God, which is with and alongside the water, and faith, which trusts this word of God in the water. For without the word of God the water is plain water and not a baptism, but with the word of God it is a baptism, that is, a grace-filled water of life and a "bath of the new birth in the Holy Spirit," as St. Paul says to Titus in chapter 3, "through the water of rebirth and renewal by the Holy Spirit. This Spirit he poured out on us richly through Jesus Christ our Saviour, so that, having been justified by his grace, we might become heirs according to the hope of eternal life. The saying is sure."
Q: What then is the significance of such a baptism with water?
A: It signifies that the old person in us with all sins and evil desires is to be drowned and die through daily sorrow for sin and through repentance, and on the other hand that daily a new person is to come forth and rise up to live before God in righteousness and purity forever.
Q: Where is this written?
A: St. Paul says in Romans 6, "We have been buried with Christ by baptism into death, so that, just as Christ was raised from the dead by the glory of the Father, so we too might walk in newness of life."
So... what are your questions about baptism that are not being answered here?