When you know your contribution, think of a good title and sketch a straight argumentation line (red line) from the problem over the solution to the proof.
This will help you to formulate the abstract and keep your paper focussed.
Computer science is science that changes, perhaps, the faster of all.
Every month something happens – the machines become more powerful, the new languages of programming are invented and the new possibilities are opened before computer scientists.
It will be equally interested for your audience if you give them clear practical reasons of why it is great and has to be done.