Hello Flavio,
There is nothing as such rocket science in it.
I can tell you some basic steps..
1) Start creating small KDT scripts like to start with Login.
2) Then start slowly reusing these scripts in another scripts.
3) Build such common scripts that will build a framework for you relevant to the functionality of your product.
4) And then start creating actual test scripts based on test cases available to you.
During this phase, keep reviewing your scripts for any optimal use and changes as applicable to your product.
You will need to strike a balance between maintaining existing scripts and creating new ones.
This should be a good start for you assuming you are clear with basic programming and manual testing concepts. Hope it helps.
Thanks,
Shrirang
