Learn Engish with Steve-TOEFL Talk (writing tips)

Try and figure out what some of the mistakes are in the following sentences:

My topic is to be about why do I prefer to work in the night than work in daytime. These is something which I am very happy to discus to you and I will try to explain.

The first thing that I need to show you is that I am a morning person an I work best when my biological clock is in tune with my schedule and that's why I find it so desirable to work from 9 to 5.