Content is King.

I think a conversation with a technical person--not me, but a web/SEO person--would really help you, because from what you've shared it seems you don't really know (yet) where things start and where they end in the virtual world.

There's no issue with you having multiple landing pages, and if you provide good, relevant content on them Google will serve them as results for relevant search terms.

With a simple Google search I found two mass landing page production and management products in moments:

http://www.pagemutant.com/

https://instapage.com/pricing

I've been marketing online for 4 years and not used this approach, but in a way a blog is no different, is it. Customized content for relevant search terms that brings the user into your site on a specific page that isn't the home page. Interesting.