Hi,
After almost 30 years of playing and then coaching career, I have decided to write a coaching manual. I'd like it to be as illustrative as possible with quality drill-drawings. My main problem is the lack of information as regards graphic software suitable for badminton. I'd be glad to receive any suggestion of those who have such experience. Thanks.

Hiya. Depending on what kind of illustrations you want you might want to use either adobe photoshop (or gimp < the free version), or adobe illustrator. As to the layout of the manual itself I suggest adobe indesign.

My suggestions as to the illustrations is to either take the pictures yourself and edit it with either photoshop or illustrator then put everything together with indesign. Or if you want to do it old school you could always do everything in photoshop or illustrator but doing that will create a huge file in either case.