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Yup - you would create a template for team member and another for events and then create pages using those templates. What I would do is create a new template with nothing but a title field and call it "Team Members" and another the same called "Events" and set the page to be hidden in its settings (therefore it won't show in navigation and nor will its child pages - hidden pages are excluded by default). Then under that page, use the relevant templates and create your team members and events. It takes a while to wrap your head around the fact that pages aren't just pages, but once you get to grips with that the possibilities are limitless

Andif you modify it .htaccess DirectoryIndex giving priority to index_old.php Then rename the index.php to index_old.php?

You can also do the contrary, if you want to change the homepage last, keep the index.html, and the server will get it instead of index.php. From there you can change the links one by one has you move the pages.