If you are asking these questions, then you should attend this workshop.
What does a professional script look like?
What is the importance of formatting?
Why can I not just write it in any format I like?
Strangely, many writers are resistant to protecting their work or they take shortcuts to save a few dollars. This is foolhardy. You must protect yourself as best you can. There are several types of protection available, and you must know which to choose.