Need advices for my pclaim


Hi.
I'm currently thinking about working on my base. First of all, you have to know that I'll be alone to work on it and I won't have resources to build walls higher than stone walls. I don't have valuable things to protect so it shouldn't be a problem. It's only that I've spent time mining and I wouldn't like to start over in another mine.
So if I've understood well, I should build a stone wall around my mine entrance+claim stone (I won't build a town bell, nothing valuable to protect and if players have money to waste it's their problem not mine). I'd like to know if I should leave space to build braziers, torchposts, ... inside this first wall or not.
Between this wall and the edges of the ground I will build a small house and put 4 fields and stuff like this. So after if I'm right I have to build 2 or 3 walls with the strongest wall inside to avoid splash damages. Here I've got the same issue : how can I know how many braziers and torchposts I need? Could I get tips like : 1 brazier every 8 tiles, ... ?
Thank you for your help.