Glad you asked...
To write an advices column, you first should have inside out knowledge of a topic. You may want to narrow down your topic so that you stay in the box.
Then again, this answer might help you...
Writing an advice column is easy and rewarding because you will be helping people. First decide on the type of advice you will give, and preferably this should be something that you consider your self an expert in. Next set up a free blog, and begin offering your services.

