Sublime Text is a very powerful editor. But it is not the same thing as an IDE like Visual Studio, phpStorm.
Compare to IDE, it is light weighted, but still very powerful.
Here is one good article on how to setup a good workflow on sublime you may have a look.
Perfect Workflow in Sublime Text
You need to install some plugins to make the editor customized as what you want.
For code completion you can try plugin called "Emmet" which was "zencode" before.
Here is the documentation of how to make your coding more efficient by using "Emmet"
After reading this, trying some plugin, I believe you will find lots of funs on using it. Enjoy~