Just to start with, you can try with the simple test plan template given below-

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1. Purpose
2. Outline
2.1 Test Plan Identifier
2.2 Introduction
2.3 Test Items
2.4 Features to be tested
2.5 Features not to be tested
2.6 Approach
2.7 Item Pass / Fail Criteria
2.8 Suspension Criteria and Resumption Requirements
2.9 Test Deliverables
2.10 Testing Tasks
2.11 Environmental Needs
2.12 Responsibilities
2.13 Staffing and Training Needs
2.14 Schedule
2.15 Approvals