Just write regularly your post, because search engine likes blog which updated regularly. Whenever you have an idea, go writing. Writing and writing. And do not publish but save as draft.
Many times due to lack of time or other reason we do not get time to write for the blog, we can use the drafts, because there is one feature on blogspot blogs, called scheduling. So when ever you are writing more than one post do not publish them at a time. Rather than this , publish one post and schedule the publishing of more posts on future dates. You can do this by clicking post options below the post editor window and then change date , time under Post date and time and then click publish. Take a look at the picture below (click to enlarge).
Wordpress blogger can do this by entering future date and time located at Publish window on right hand sidebar. Please take alook at the picture below.
This posting schedule helps you to take vacation from blogging , search engine benefit and good impression on visitors.