A friend just asked me: “before jumping in and trying to read the whole of Andrew Fuller’s works, what would you recommend to start with?”
Well, without being self-promoting I would first of all recommend reading my edited The Armies of the Lamb: The spirituality of Andrew Fuller (Dundas, Ontario: Joshua Press, 2001). This is a great entry point into Fuller: there is a small bio, an essay on his piety (the heart of all of his writing, preaching, and living), and a judicious selection of his letters. Letters are always a tremendous way to understand a person.
Then, assuming you have access to the three-volume Sprinkle reprint [The Complete Works of the Rev. Andrew Fuller (Harrisonburg, Virginia: Sprinkle Publications, 1988)], you need to read the following to begin:
1. The “Memoir” by Fuller’s son Andrew Gunton Fuller in vol. I (pages 1–116): this is fabulous for the diary extracts. The whole diary is not there—we hope to have this in the new critical edition—but there is enough to reveal the tenor of his life and thought.
2. The nine circular letters that Fuller wrote for the Northamptonshire Baptist Association on key theological and practical issues: vol. III, 308–66. These would were an annual custom where the association would ask one of her ministers to draft such a letter on behalf of the association and it would be sent to all of the churches in the association.
3. Strictures on Sandemanianism (vol. II, 561–646). A rebuttal of a significant theological error. But in the course of it, Fuller explores a lot of theological ground.
4. The Atonement of Christ, and the Justification of the Sinner, edited Andrew Gunton Fuller (New York: American Tract Society, n.d.): this is a compilation of Fuller’s thoughts on two key issues.
5. Sample his sermons in vol. I of his Complete Works of the Rev. Andrew Fuller.
Blessings on you as you read!