Welcome to the forums
A tip I can give you is to not hire the martyr unless you have a very specific reason and use for it (i.e. blowing up someone's mine somehow). What are your other hires instead of that?
I would probably do some speed specialists (smuggler specifically) if you're being attacked. It lets you move drillers and specialists around your outposts quickly.
I wish I could help more but I don't have enough info of your position in the game (upcoming hires, allies and enemies, etc.)
You seem to be doing well if this is your first game, good job and good luck!
A wise guy's always right; even when he's wrong he's right
-Lefty, Donnie Brasco
400th Page TPBM