You might want to look into Laravel (https://laravel.com/). It has a lot of stuff you won't need, but it's also has a very intuitive API, is well documented and will lead you down a route of best practices for this kind of website. I've found that server-rendered websites using Laravel are pleasingly simple.

See https://laravel.com/docs/5.8/blade for specific documentation on templates and forms, although I would recommend a more comprehensive look through the documentation, or working through a tutorial.