Freelance developer with SOLID Wordpress knowledge

I have built a one page word press site with the DIVI theme. The additional functionality I require will be as follows. 1a). Alphabetical categorisation of newly added contacts (front-end) 1b). Ability to send email at click of button with Dynamic contact information 2. The website should keep track of the emails sent in a table so that I can filter by sender, receiver, month, year and numbers of emails sent 3. wp-admin/[login to view URL] Users of the site – I will create user profiles for each user and will want a mechanism to add and list "join date" and "payment date". This list should also show how many emails were sent and received by profile in a calendar year 4. We will use the Wordpress user system for all users of site but we would need some front end log-in so they don’t have to log in to the back end.