Just Drop By

Yesterday my superior requested me to write a few letters showing our stand regarding several issues arising. When come to write a letter than I'm stuck. Even though the idea is already there but I still have a problems for choosing the good sentence structure in order to ensure the messages that I wrote will deliver and the receiving parties fully understood. Normally my letter is very simple have just 3, 4 sentences and I am not happy with that. I am not good to elaborating the ideas.