The key to long-term agile planning is keeping your project details and task estimates in sync with your roadmap.
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Start with Big Picture: a Vision. 
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Identify Big Items: Define initiatives. For example, to support the security theme, we’d need to build a new foundation, with sheer walls on the frame, solid-core doors, and double-pane windows. 
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Break it Down: Fill Backlog. 
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Estimate: How long does a task take? 
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Create Smart Releases: Interior and Exterior. 
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Generate Roadmap and Requirements (two “R"s). 
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Share with team and validate. 
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Keep improving. 
Errors are allowed!