First, download Sketch Runner to help you install these plugins easier. It's like Spotlight (or Alfred) for Sketch.
These are the plugins I can count on to get the job done. Now, since there is such a huge variety, don't feel like you have to take my word and download every single one. Even I don't have every one of these installed on my machine right now 🙃
This was compiled for the attendees of "A Really Good Beginner Sketch Workshop for Designers" for the Columbus Web Group, but why not share the love?
Alrighty, on the with the show 🎉