Post Ideas: At times you will just run out of ideas for post not sure what to do. use google and apps like Evernote to note down all that ticks in your mind. Something will surely turn into a new post.
Its not just good content that matters, presentation of post is very important too. Have attractive pictures, fonts etc to hook the readers.
Write regularly, neither too often nor too rarely. Two to three blogs a week is a good frequency to maintain.