It gives tips on how to find an agent, how to write a query letter, etc. I strongly recommend getting an agent, as opposed to submitting manuscripts yourself. I will give to you the same philosophy that I followed for myself. Most people write about what they know, and with that, comes a certain level of knowledge and passion. Also, don't give up.
Writing is such an objective profession.
There is no right and wrong, it is all a matter of taste. If you are like most published authors, you will face plenty of rejection before succeeding. Know that this is all part of the process. However, having said that, you must also be willing to listen to, and accept criticism, and be ready to make changes when necessary. I do not consider my books a series.