Feel free to ignore my advice as it's probably going to seem contrarian. That said, for you as a beginner to product photography--if you are thinking of doing this commercially--my opinion is that you're on the wrong track. You'll be competing against others who have long experience with large format view cameras but now have the tremendous economic and immediate-feedback advantage of having largely abandoned LF for digital imaging.
Cameras and lenses may now be cheaper than ever, but it's only because they were once so ubiquitous in commercial and product photography and that are now obsolete for this purpose for most uses. In high volumes, film and scanning of LF film represented a huge expense.
It all boils down to the final use of the images. If you're making enormous enlargements, LF still rules. For many other uses (including most print media ones), it's merely a stylistic choice to use LF over smaller formats, and not the foregone necessity it once was.
Oh, and if you're set on LF, you'll do well to consider a studio monorail with full moves, and interchangeable bellows. Good news is that they're comparatively cheap. If your products are small, you may need a lot of extension (18" on up). Any reasonably good condition Sinar will be more than adequate.
A 210mm lens, while a terrific choice for portraits, is probably too long for easily shooting macros on 4x5. Shorter focal lengths like the 120mm macros work because have large image circles at close focusing distances.
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