Like Harold said there's no right or wrong answer to the question of how often you should blog. Think quality over quantity. Write the best posts you can and be consistent with how often you post. Say that means one post a week. Fine. Write the best post you can each week. Then later if you feel up to it try 2 posts a week, making sure to keep the quality to the same level as when you posted once a week.
News sites generally need to post more often. It's not uncommon to see them post a half dozen times a day. Business sites generally won't need to post that often once a week or even every other week can be enough. The most important thing is quality.