hmm.. Managing adwords is not that easy
Here are a few tips to get you started:
- Select proper Keywords
- Use Geo-Targeting
- Turn Off Content Network
Also, offline promotions would work great for your seminar like distribute some flyers, email your friends etc
Also, try other traffic methods don't only stick with adwords, try classifieds, yahoo and gmail groups, video marketing on youtube, orkut myspace facebook, use social bookmarking to get attention!!
And one advice delay your seminar of you havent found anyone yet
Feel free to Pm me if you need any additional help