You can start the db/servers by navigating as mentioned below.
or use the Admin Console at
to start up the individual managed servers.
As you said, I needed to go to /WCPortal_JSK_Linux.x86-64/linux64, I found all the scripts that I needed to start or stop any server or database. But specifically if you need to run evertything, (was my case) You just need to run the ./startup.sh script and wait, it will run everything but take a while.