Your topic will probably evolve as you do your research so don't worry up front about whether your topic is too broad or too narrow. You can adjust it as you go along.
From NCSU Libraries
What two or three words or very short phrases catch all the elements of your topic?
Topic: How do Australian Aborigines grow/catch/find food and how do they prepare it in their long history before Europeans colonized Australia?
Words or short phrases: Australian Aborigines; food; pre-colonization
Now think about what you mean with each of these phrases or words and come up with other terms or phrases that might mean the same thing or be complimentary. In other words, what else might you search for when trying to come up with sources?
food - meat, vegetables, farming, hunting, gathering, fruit, grains, fish, fishing
Australian Aborigines - different tribes of aborigines, Awabakal; Badjalang; Banbai; and many more (in researching this, I found that there are so many groups of aborigines, I narrowed my topic to those in New South Wales), New South Wales
pre-colonization - prehistory, 17th century (note that Australia was colonized in the mid-1700's so any century before that would be pre-colonial), 18th century (could compare pre-colonial to early colonial)
Choose which terms best describe what you are looking for as your initial search terms.
What kind of information do you want to find?
What type of source will best fit your needs? Check out this page from Virginia Tech. It defines different source types and gives what they are best used for and examples.
We have guides to help you format your citations in four different styles. You can choose any style you want for the Anth 220 paper but you should be accurate and consistent.