You are in the Mistlands and don't know how to structurally defend your base? That seems wrong on so many levels... I am phlumoxed that it has just occurred to you now, in the 6th biome that bases need physical defenses. There are 8000 videos on this subject and probably at least three in the last week as threads here. Wiki it.
I get it if you have played a week, are in the Black Forest and have realized all the neighbors are annoying but like how do you have a barley farm in the plains, how do you grow food anywhere in the game? All the events with trolls and wolves running through your base? Am confounded. Tell us more, you must have some fun stories.