ooh this is fun

seems like everyone is making a mountain out of a molehill here
i'd suggest Joomla (as DH said) and using a template which is readily available (pay for a decent one) to upload and manipulate very easily
Joomla sites are easy to edit, easy to add extensions (some are free, better ones you pay for) to (such as ecommerce bolt ons, forums etc) and are already part optimised for SEO (use google developer tools and analytics for the rest)
as for adobe products - consider creative cloud - full access to virtually the entire adobe range for a monthly fee and always have the latest product - spread the payments

rome wasn't built in a day, but you might as well let those that have the knowledge do the coding and then concentrate on the content yourself, will help get rome built just that bit quicker

oh.. and don't forget your social media - you'll get out what you put in