Quotes given by insurance companies can vary widely, so devote a good amount of time to researching companies and getting comparison quotes. Be sure each quote is for same amount of coverage you determined you needed in step one, so you are comparing apples to apples. Online comparison sites, insurance company sites, and insurance agents can all help in this process.
Here are some online comparison sites to get you started: Netquote.com, Insurance.com, progressive.com, insweb.com, and autoinsurancecenter.com.