Execute multiple Shell commands in order

My goal is to create a SKILL script to execute a list of Shell commands one after another. I've done similar things for a single command, but not multiple. Below are the steps I need to complete, any direction (or confirmation it can be done) is appreciated. 

1) Open new Shell window in the background (not the shell that Cadence was launched from)

2) setenv 12345 in new window

3) run command X

4) cd /dir/1234

5) run command Z