I need to start by saying that I have never understood why people keep asking advice, especially about books, without providing any details at all. It’s like asking, doctor, I have a pain: what should I do next?
At the very least we need to know who the biography will be about. A local celebrity? A national celebrity? An international celebrity? A historic personage? A local hero? A war hero? A veteran? A disgraced politician? A magnate? An inventor? An athlete? An artist? Somebody in religion, in politics, in science, in show business, in education? Living or dead? Is the book aimed at adults, young adults, or teens? Men or women? Christians or seculars? Gays or straights? Blacks, Hispanics, Asians, Arabs? It is someone whose story has been told before or not? Somebody who cooperated with the author or was against the book being published? Somebody whose name would be known to to average person? Somebody who is the subject of an enormous controversy/scandal/mystery? Somebody with web sites about them? A fan club? People who buy their collectibles?
The person who advises you has to know the answer to all these questions and a thousand more. Same with the author. Is he a recognized authority? A fan? Obsessed about the person? A relative? An academic? Does he have media contacts, church groups, parents organizations, fraternities/sororities, message group pals, Tupperware societies, anybody or anything he can network and exploit? How much time and money and personal effort is he willing to put in? How does he expect to get a self-published book into bookstores? Does he live in a city with a number of bookstores/newspapers/media outlets? Does the subject of the biography?
Really. A thousand questions. Can the author come up with one sentence that would make people buy the book? Can he get blurbs from famous people? Can he write?
Nobody is going to steal the idea, which is the reason most people decline to give specifics on the net. The book is already written; we can’t get it out first and steal his thunder.
Generically speaking, you need to wring him dry of every possible hook that the material has, every possible connection that he can make use of, every possible audience that would be interested in the subject of the bio, and then work them all simultaneously to try to generate even a tiny bit of buzz. If he is willing to drive around to every group, conference, book club, book store, school, club, society, classroom, and church within 100 miles he may get some awareness if he also works the other media angles at the same time.
And then he needs to ask himself what he defines as a good outcome. 100 copies? 1000 copies? 10,000 copies? Most self-published authors get no further than the first. A real go-getter might make the second. Only a very few people with special circumstances that happen to hit the zeitgeist ever make the third.
A marketing plan for a self-published individual has to be completely and totally customized to the book and the person. Generic advice is mostly worthless because it will be inadequate. Either you have to pump him dry with questions or find someone who knows what questions to ask. Either way it’s a long, and usually painful, process.