Give out things like e-book or softwares that is related to your product or niche market. You can also submit articles that is related to your niche to article directories like www.ezinearticles.com
REGISTER YOUR SITE
Register your site with some top online directories that is related to your niche.
DO OFFLINE ADVERTISING
You can drive traffic to your site by writing column in newspapers, magazines, church journals and trade journals that is related to your niche.
ISSUE PRESS RELEASE
You can issue press release about your business. You can search the net for press release sites that can offer this service free.
ADVERTISE IN FREE ONLINE CLASSIFFIED SITES
You can make use of some notable free online classiffied sites like www.craiglist.com, www.classifiedforfree.com, www.usfreads.com.
GET ACTIVE ON SOCIAL SITE
Contribute your views in your area of specialty in forums. You can do well by responding to people's post especially where it involves providing solution to their problem. By doing this, you will be seen as a solution provider and an expert in your chosen niche.