I highly recommend you read the cheat sheet available
here; it provides a good overview of the interface and all of the keyboard shortcuts. Once you get used to them, launching/switching applications, etc. is ridiculously quick.
There are also a ton of extensions available that will let you tweak the shell; they're installed/managed by pointing your web browser
here (kinda non-intuitive, they need to work on that).
Finally, you can configure a bunch of the typical things you'd like to be able to tweak by installing gnome-tweak-tool. Just run
yum install gnome-tweak-tool
as root.