Writer's block is one thing, but not knowing what to write about... and you just started writing. That is why I recommend to start with something that you do every day, or a hobby or something that you are well familiar with and it will be easy to write about. Not everyone is an experienced writer, but writing about things you know and like is the best thing to start with... that is unless of course you are only after the rewards and want to write popular content to get popular... :)