well, we are going to need a little more information before we can troubleshoot.
What error are you seeing when you are trying to build and deploy your site?
have you worked through the docs on setting up a site as described here?
This Support Guide contains a ton of useful debugging tips that can likely help you solve your problem 
We also recommend trying to search the forums with the build error you encountered.
If you are still having problems, please provide as much information as you can on what you have already tried, what your build settings are, your package.json, etc. Thanks!