According to IEEE 829 standard there are around 19 content items needs to be consider while creating the test plan.
Contents of Test plan:
- Test Plan Identifier
- References
- Introduction
- Test Items
- Software Risk Issues
- Features to be Tested
- Features not to be Tested
- Approach
- Item Pass/Fail Criteria
- Suspension Criteria and Resumption Requirements
- Test Deliverables
- Remaining Test Tasks
- Environmental Needs
- Staffing and Training Needs
- Responsibilities
- Schedule
- Planning Risks and Contingencies
- Approvals
- Glossary
please find detail IEEE 829 test plan attached :IEEE-TestPlan