Your post is a little vague, most of us let need dictate which plugs we buy, but there are lists in the archives on which ones many of us find essential. Do an advanced search.
As for film looks, the best place to start requires no plugins at all, proper lighting and camera technique can make just about any true 24p camera look like film. That’s why they were invented. Short of that, my system is using the Nattress plugins, which are fast, good and cheap. Make that fast, great and cheap.