Why do you recommend a trademark previous report before a trademark request?The main function of the Trademark previous report is to help you in evaluating its registration chances.
Through the study you will be advised about the class(es) in which your trademark should be registrered (and what products or services you need include in each class). It is very important to protect the adequate class(es) to avoid under protection (competence can take adventage of it) and over protection (you are losing money).
Finally, with the previous report you can save a lot of time as it takes months to the Trademark Registration Office decide whether to accept or reject the processing of a request.