The first way to test your advertisement or newsletter is to put it aside and check it a day or two later. Never write an ad or direct marketing copy and send it out immediately after a brief check. By waiting and re-checking your copy, you'll always find ways to improve it.
When your mind is absorbed with the writing procedure it's easy to miss things. Completely forget about it and occupy your mind with other thoughts and projects. After a good break, a clear mind will help you to easily spot mistakes that weren't so obvious when you were engrossed in the copy. Plus you'll also find ways to improve the copy overall.
I am about to set up a clothing label, is there any website links or info available for people setting up a business for the first time? Also i`ve been told about a type of copywrite where you can post everything you want to be copywritten to yourself through recorded delivery, is this true?