2) Generate a new private key
Several tools exist to do so:

- one is located near the bitshares executable (if you compiled yourself) in
  "programs/utils/" and is called bts_create_key

- In the bitshares-pytools repository (github.com/xeroc/) there is a tool called
  genbtskey.py (in tools) that generates a new privkeypubkey

- you can also use bitshares-js as shown at https://github.com/xeroc/jshares/blob/master/generateRandomKeysAddresses.html
 

1) "programs/utils/bts_create_key -- doesn't exist.
 
moreover, the "cmake ." run in a any sub directory of "programs/utils"  throws an exception

CMake Warning (dev) in CMakeLists.txt:
  No cmake_minimum_required command is present.  A line of code such as

    cmake_minimum_required(VERSION 3.10)


2) genbtskey.py at github.com/xeroc/ -- doesn't exist

3) the link is dead

how to generate  new private key?

In a private testnet if I already have one main witness running as one node, how can I add one more witness as a separate node?

Should I run the 2nd node with the key "-s 0.0.0.0:1234" ? Only? Or is the approach different?