1) When you make a website with a particular purpose,make sure that the content is worthy of having links from other similar niche-specific websites.

2) Register and participate actively in forums,topic hubs etc

3) Seek places where you can get free links

4) Participate in as many link exchange programs as you can.

5) Comment on other sides about your product,services or whatever your website gives.

6) Start a blog(weblog) and write about your products,services.

These are some methods which can help you build good links for your website,blog or forum or anything.I hope you were helped by them

Swastik