On wood siding, prime all sides and any cuts (you can purchase a dauber of primer that makes that easy). Silicone caulking... be careful as some do not accept paint/stain which will be applied later as temperatures warm up.
If you can, cover the CDX with a HydroGap or comparable product rather than a Tyvek. It has raised spots on it that will allow for a gap that condensation will escape through... it lengthens the life of the siding, and applied architectural coating (paint/stain).
If you intend to use an oil-based stain like a Cabot OVT, make sure the primer and caulking that you are using is compliant with that product.
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