Thanks for the question! I have put it in the notes to mention in the show today!

As there are some nice projects on HIVE that follow introduction posts, I suppose that there is no need to invest anything to start blogging and creating... If a newbie creates a normal, honest introduction post, it will probably receive enough upvotes to will get them enough HivePower and resource credits for normal engagement on HIVE... So, I would say that between 50-100 HivePower is enough for the start, and to continue building on top of that by engaging and creating...