Write your own information product rather than hiring somebody, because you know the people you are writing for better than any freelancer ever will. Laura Draft argues that in a numbered series and adds the part people miss. The writing itself clarifies what you think, and one sentence pulls the next out of you.
She is firm about bought and rented email lists. You cannot tell whether the addresses were given willingly or harvested, and sending to harvested ones makes you the spam problem, so the advice is to stay away entirely.
The blog is not only business. There is a long piece on how the cocaine trade reshaped a small West African country, reported rather than editorialised, and it is the most surprising thing here.
A profile of a politician who reversed a diabetes diagnosis through diet and exercise opens the whole thing.
Read the information product chapters in order if you have been meaning to build a list and never started.