During Unit 1, you are expected to read Book 1 of Vergil's Aeneid in its entirety. Take notes on the plotline and characters. Feel free to use resources such as Sparknotes to guide you on the most important points, themes and motifs, however, be sure to read the actual text itself.
I suggest you find a book or internet source that you enjoy, since the styles and translations of the text can vary greatly from one author to the next. For intanse, some will rhyme, others will be written in old English and others in more standand. Choose whatever style you like best. Below are some examples resources, but you may choose others that are not on the list too.