You will find an outline and introduction to Jeremiah here.
Here is a from the Book of Common Worship to use before reading.
Blessed Lord, who caused all holy scriptures to be written for our learning: Grant us so to hear them, read, mark, learn, and inwardly digest them, that we may embrace and ever hold fast the blessed hope of everlasting life, which you have given us in our Saviour Jesus Christ. Amen.
An Outline of Jeremiah (based on Overholt)
I. 1:1-25:38 Confronting the People with Words and Deeds
II. 26:1-45:5 Narratives Concerning the Nation’s Fate
F. 37:1-44:30 The Fall of Judah and Its Aftermath in Palestine:
42:1-22 The remnant under Johanan ask Jeremiah to ask God what they should do. Their inclination is to flee to Egypt. After 10 days Jeremiah receives and answer, they are to remain in the land and not to be afraid of Nebuchadnezzar. To go to Egypt will be disaster.
43:1-13 The leaders do not believe Jeremiah, in fact they accuse him of lying. They travel to Egypt, Jeremiah goes to Egypt also. There were Judean refugee settlements in Egypt. Jeremiah is instructed to perform an oracle (v 8-13) showing that Egypt is not safe from Babylon. In 568 bce Nebuchadnezzar did campaign against Egypt.
44:1-14 Again Jeremiah warns of there severe consequences of going to Egypt. They are warned against repeating previous generations’ mistakes.
44:15-28 The refugees respond to Jeremiah by saying in the past when they worshiped the “Queen of heaven” (perhaps referring to the long reign of Manasseh -2 Kings 21:1-18- they prospered. When they stopped worshiping her during the reform of Josiah they encountered hard times. The Queen of Heaven was the Babylonian-Assyrian goddess Ishtar. In verses 20-30 Jeremiah responds to the people.
G.45:1-5 An Oracle to Baruch: The first verse dates this oracle to 605 bce. The oracle is out of chronological sequence. This is the end of the third cycles of oracles and ends, as the other cycles do, with a reference to the scroll of 605. The oracles is an oracle of judgment but Baruch is told his life will be spared.
Here are several good sources to aid your reading.
Anderson, Bernhard W., Katheryn Pfister Darr, Understanding the Old Testament Abridged fourth Edition. (Upper Saddle River,New Jersey: Prentice Hall) 1998.
The New Interpreter’s Bible, Vol 7, Keck, Leander E. ed. (Nashville: Abingdon Press) 2001.
Hutton, Rodney R. “Jeremiah” in The New Oxford Annotated Bible with Apocrypha: New Revised Standard Version.Coogan, Michael D.; Brettler, Marc Z.; Perkins, Pheme; Newsom, Carol A. (2010-01-20) Oxford University Press. Kindle Edition.
Gold, Victor R., William Holladay, “Jeremiah” in The New Oxford Annotated Bible with Apocryphal/Deuterocanonical Books, Metzger,Bruce M.;Murphy,Roland E., eds. (New York:Oxford University Press) 1994.
Overholt,Thomas W. “Jeremiah” in HarperCollins Bible Commentary Mays, James L. ed.(San Francisco: HarperSanFrancisco) 2000.