Report, report, report. Dig, dig, dig. Think, think, think. Don't stop being a reporter because you've become a columnist.
Teamwork is better than isolation, especially for a columnist.
Don't commit to being a columnist unless you're willing to do it right. Report your behind off, so you have something original and useful to say. Say it in a way that will interest someone other than you, your family and your sources.
I wanted to be a columnist so badly that I took a huge pay cut to leave Forbes, which wouldn't give me a column, and join Newsday, which wanted my column for its Sunday business section.