Moving site from html to Wordpress site: Should I port all old pages and redirect?

[gheh2013]

Any help would be appreciated.

I am porting an old legacy .html site, which has about 500,000 visitors/month and over 10,000 pages to a new custom Wordpress site with a responsive design (long overdue, of course) that has been written and only needs a few finishing touches, and which includes many database features to generate new pages that did not previously exist.

My questions are:

1. Should I bother to port over older pages that are "thin" and have no incoming links, such that reworking them would take time away from the need to port quickly?

2. I will be restructuring the legacy URLs to be lean and clean, so 301 redirects will be necessary. I know that there will be link juice loss, but how long does it usually take for the redirects to "take hold?" I will be moving to https at the same time to avoid yet another porting issue.

Many thanks for any advice and opinions as I embark on this massive data entry project.

[Linda-Vassily]

I recently did something similar and left behind a bunch of "thin" pages, just be sure to check your internal links to make sure you are not linking to a page you are 404ing. [Screaming Frog is great for this—if you don't have it, you should get it.] You can always "revive" any that you see a lot of people trying to reach. My redirects took hold quickly—I couldn't even say how long, it was that fast. [Mine was an old domain and frequently crawled.] Good luck!