1. Collect information from the library, internet, interviews, etcetera.
2. Read it all. All of it.
3. Take so many notes that you would shame Tolstoy.
4. Make sure your notes are in such a ludicrously archaic and indecipherable form that Tolstoy would literally spin in his grave as such that the thanatropic energy harnessed from his whirling corpse could power a Hyundai.
5. Put all of your sources into a annotated works referenced page. This is to help you in the long run. You know it does as it helps you remember what sources said what.
6. Of course, it's also a huge pain in the ass. Most likely you will skip this part often until a small stack of sources begins to get so tall the cat climbs to the top of it to survey his territory (e.g., you). Then spend four hours logging that shit into EasyBib and hoping a publisher doesn't make you switch it all from MLA to APA, or, god forbid, Chicago Style.
7. Write!