This is a good read. It has great tips:
Choosing the right badminton string for your racket is important. It plays a big role during your badminton game and affects your performance. How you want to string your racket depends on your style of playing badminton. For example, stroke/ rally players use different strings compared to aggressive/ attacking players.
2 things to consider when stringing your racket:
- Diameter of the string
- String tension
Read more: http://www.how-to-play-badminton.com/badminton-smash-technique.html
I also came across with this article: https://badmintondoubles.wordpress.com/2012/03/30/pm-fail-david-cameron-is-not-good-at-badminton-youtube/
Petite Lee 