What are the pixel dimensions of your files?
At what size do you want to print them?
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You might be in luck and get some guidance on this forum. However, I'd advise you to go to Blurb's user forum and also search their FAQs. I seem to recall that your question is addressed.
I've used BookWright a number of times and the photo boxes in the page templates (whichever you select or design yourself) will tell you the pixel dimensions required if you hover your cursor over them.
Did you know that you can create a Blurb book layout directly in Lr? You might want to check it out.
If you want to export images and use BookWright, don't scale your exported images either up or down. Export them as jpegs with no compression and use the sRGB icc profile. BookWright will handle the scaling of the images if needed.
The resolution is irrelevant without knowing the image size versus the print size so it's best to just keep the images at full size.