Better to build out landing pages or 301 re-directs

I'm about to do some a lot of work on a category on my website. I'm
going to target a bunch of phrases. Is it better to make these pages
be landing pages? Or better to do 301 redirects?

My sense is it's a better experience to make them all landing pages,
however, I'm concerned that organizing the content could quickly get
unwieldy. Does anyone have any tips?

Lastly, would my site get penalized if I build all these landing
pages, but never really integrate them back into my site via other
links? In other words, when these pages come up, I'll have links to my
site in them, but then on my regular pages, I likely won't link out to
them. Make sense?

Any comments are much appreciated.

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