And while you're there, maybe ask where they're likely to be found, how they (or you) would be searching for you, and how best their personal or business goals would be served by what you have to offer.
Don't underestimate the Mental Game aspect of this work, it can be absolutely brutal. Recommend reading Mark Divine on his mind gym concept, unusually good >http://www.goodreads.com/book/show/17465530-the-way-of-seal
1/ State the objectives you want to achieve. They should be measurable e.g. % increase in signups, emails collected, etc.
2/ As @noelwesh mentions, create a checklist
3/ Measure the impact of each action in the checklist
4/ At the end of a 'campaign', evaluate what worked, what didn't, how to improve things, how to learn further.
5/ Iterate.
- tweet it - retweet from personal accounts - post on relevant forums (e.g HN, sub-reddits) - post on relevant mailing lists
Monitor every few hours for comments, and reply. It's important you don't turn monitoring into constant browser refreshing. Set a timer if need be, and don't check for comments till the timer expires. Suggest 2hr intervals.