Heh. Here are my 10 steps to writing a fanfic I've been planning for years:
1) think about something I like
2) invent some people to act it all out
3) write it down before I forget
4) lay out plotlines and create side-characters and locales
5) draw rough sketches and thumbnails of the same
6) invent worlds, cultures, and connections to existing canon
7) repeat steps 1-5 multiple times to create a

lose all the paperwork related to it
9) get depressed and give up for months or years
10) rinse and repeat entire cycle; try to remember everything from before.