As AI tools like ChatGPT become increasingly integrated into language learning education, this study investigates how these tools affect first-year ESL learners’ writing skills over two semesters. One group used ChatGPT for brainstorming, organization, and grammar checks, while a control group relied on teacher-led workshops, peer-review sessions, and textbook-based grammar practice. Data from pre- and post-tests, level assessments, and self-efficacy surveys indicate stronger improvements in writing fluency, organization, and confidence among those using ChatGPT, especially across different proficiency levels. However, findings also highlight potential pitfalls, including over-reliance on AI outputs and confusion around academic integrity despite the introduction of ethical AI use guidelines. This presentation discusses the benefits and challenges of integrating ChatGPT in first-year ESL writing instruction, emphasizing the need for structured guidance so students can effectively enhance their writing skills while developing responsible AI usage habits. Attendees will gain insights for balancing innovative technologies with foundational writing instruction, thereby promoting both language proficiency and ethical accountability.