A single comma should never separate the subject of a sentence from the verb. The reader can have difficulty finding the verb when the subject and verb are separated. A pair of commas may set off a phrase. First person is used sparingly. It is occasionally used to describe an opinion held by the author.
Active voice is better than passive voice because it is usually easier to understand.
The subject is the most important focus of the sentence, and these words waste that focus. All of these constructions usually create a weak sentence structure that can be improved. When using a pronoun, be positive that the antecedent is easy to identify. Sentences with lots of pronouns become impossibly confusing when the antecedents are not clear. These words can be very confusing and make the reader spend extra time trying to decipher them.