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Daily Blog Tips. I don't always have time to keep up with Problogger or John Chow, but you can get DBT in your inbox once a day and its a good way to get some basic tips. Read, read read everything you can.
The best way to do it is to just start a blog and learn as you go. Every blog I build is a little bit better than the last one because I take what I've learned from the other ones and put it to work.