Hello Mustafin Artur,
For the help documentation problem, we have found that uninstalling all versions of the VS SDK, re-installing the August 06, VS SDK and then installing VSTA removes the naming collision with the help document URLs. After following these steps, the help documentation URLs should all work.
To learn how to integrating VSTA, please follow the walkthrough steps using the shape app sample. When you have done this successfully, you should be ready to integrate VSTA with your own application assemblies.
Whenever you have a question about the walkthrough or your own integration of VSTA, let us know what your specific question is and we will find the answer for you or help you determine the answer.
-Gary