Create aWordpress plugin to manage different text and styles on different pages

I have a Wordpress site with a theme installed. I need to create pages that will show different company logos and company information each time, so for example the page [login to view URL] would show a different main logo, and theme background color and contact information than the page [login to view URL] I need a plugin which would create an additional button in Wordpress admin so I can manage these profiles. Info to enter for each would be: 1) Company name 2) Slug (i.e. company-abc or company-xyz 3) Upload logo 4) Phone number 5) Email address 6) 2 color pickers, one for theme default highlight color, and one for background color. Once that company is created in the plugin, anyone who visits [login to view URL] will see that company logo at the top. It will say "Welcome to company ABC", and it will have their own phone number and email address link in the header. I would guess that Id insert shortcodes in these locations which grab the correct company details? It would also have changed the theme for this specific page by using the 2 colors specified in the plugin for that company, Looking for costs and ideas on the best way to manage this. Please post links to existing WP plugins you have created or anything similar. Thanks