what should you do before you approach a literary agent?

a.
advertise and publicize your novel
b.
start working on your next novel
c.
prepare a marketing plan
d.
prepare a synopsis and query letter

While you should do them all before approaching a literary agent, the most important one is

D - Prepare a synopsis and query letter.

But most definetly start working on the next novel and the literary agent will also ask what advertisement you've done and if you have a marketing plan.

one time i was sleeping on a bench outside of walgreens and someone offered me money because they thought i was homeless

explanation:

you have to tell us what you're talking about or it's impossible to answer.