Editing existing website - images/formatting

Description

We have an existing website that we need help with selecting/editing images (possibly) and general on page formatting (removing/adding 1-2 new sections, adjusting specings and generally tidying things up.
Once current site is finished we then plan to use the same theme on another 3 sites (happy to share URL's as wordpress is already installed on a child theme) delete existing content and build them all out again.
To do all sites is likely to be a 6-12 month ongoing project mostly because we need to write the content as we go and time will be the main limiting factor.