work flow

just breath

in the terminal, please do. 

change directories into cls, which is done like this: 
cd project_name, and the output should be
Desktop$ cd project_name which in this case is cls, so it'll read something like: 
Desktop$ cd cls
cls(master)$
once in the directory cls, please bundle the dependencies like so: 
cls(master)$ bundle install 
next up, start the mysql server like: 
cls(master)$ mysql.server start
....SUCCESS!
cls(master)$
next up: start the rails server
cls(master)$ rails s
head over to your browser of choice and type 
localhost:3000 in the address bar
in the meantime, let me know if you have any further questions.