Start with the decision the model must support
Are you comparing roof options, presenting a home to a client, or checking how a pool sits beside the house? Those are different jobs. Tell me who will use the model and what they need to see. A presentation model may need detailed materials and landscaping; an early design study may need simple geometry that is easy to change.
Send the latest plans, then identify what is missing
Useful starting files include CAD plans, dimensioned PDFs, elevations, sections and site photographs. Mark which revision is current. If a drawing has no scale, include at least one reliable dimension and the units. If the roof or window heights are undecided, say so. I can separate confirmed information from assumptions instead of quietly turning a guess into part of your model.
Explain the level of detail
A distant view of a building does not need the same detail as a close view of a kitchen. List the rooms, facades and outdoor areas that matter. Share a few references for finishes, planting or furniture, with a note about what you like in each. A short annotated reference is usually more useful than a folder of unrelated inspiration.
Agree on the handoff
If you will edit the file, tell me which SketchUp version you use and whether you need separate scenes, components or areas of the model. For still images, specify the intended use and approximate output size. For a walkthrough, explain the route and audience. State your deadline and identify who will collect feedback so conflicting comments can be resolved together.
A brief you can send today
Include the project type, current drawings, key dimensions, required views, desired deliverables and deadline. Add a short list of open questions. That is enough to begin a useful conversation about scope and a fixed quote; the remaining details can be clarified before modeling starts.
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