Hi Mandi! Welcome to the forum.
Have you read around about the various forms of poly? There are some great resources out there - if you've read them already I won't bore you again, but if you need any, let me know.
Do you have an idea of the sort of setup that would be your "ideal". Some people can deal with more folks in their lives than others. Do you foresee you all living together, or each maintaining your own places?
Are you currently in a relationship?
"Listen, or your tongue will make you deaf." - Native American Proverb