Welcome to the forums, You have said that started already so did you used any sites for learning? Feel free to ask any questions here also install some plugins for chrome in order to edit codes for CSS.
It's good to see that you learn't something, do you like to become fully CSS coder? Do you interested in any of these editors? 30 best Google Chrome extensions
There are many more plugins, but try with the one you want to use it. Let us know if you need any further help. CSS is easy to learn that can take upto15 days to become expert in it.
If you are trying to build a webpage then please post here if you need help on the project.