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At the moment Yola does not offer any database or membership login integration with our site builder. If you consider yourself a novice in IT related matters, then you'll probably find this a good thing. It can be very tricky setting something like that up.
I would recommend doing what some of our users have already done in similar situations- Creating a site with different categories, and then links to the individual businesses in that category.
You can either add each business category as a page or as a subpage. Check out this tutorial on Creating Subpages.
Once you have your category pages setup it is very easy to add the links and info to the individual businesses in that category- Creating Links and Adding Text are great tutorials you should take a look at.