As zvi said, getting an answer to a single question is not normally how it starts.

You'll sometimes see people posting questions like that and getting answers, but it's usually because they've already got a large circle of readers who they've built up a relationship with, or because there's an active community discussing related topics. (e.g. synecdochic, damned_colonial or cleolinda could ask any random question and someone would probably answer, but that's because they've got a lot of regular readers from a fairly wide range of backgrounds. Most people who are active in the community could ask any question related to the topics they normally blog about, or that their readers tend to be interested in - e.g. zarhooie and yvi have recently asked about knitting and got useful answers, and rho asked about software for Macs.)

Dreamwidth, as a social media site, tends to be somewhere half-way between blogging and social networking, rather than something like Yahoo! Answers where complete strangers will answer questions without any other prompting.