I was never very good at the poetry stuff... but if you ever need any help in math or science, I'm all over it!
Anyway, I'd suggest doing a quick google/wikipedia search for Dickenson or the title of the poem. You could probably find more than enough to get you started and on the right track. Here's the wiki article to get you started, it has some pretty good info on her life.
Disclaimer: Wikipedia is written by users, so there really isn't a good way to judge whether or not the information is valid. So always check it against other stuff.
Disclaimer 2: Make sure you don't plaigarize off of websites! Plaigarism is the fastest way to fail.