Deploying blog with Octopress on github

Question

What i'm doing:

I have been trying to deploy an Octopress Blog using github as host and jekyll and liquid for designing purpose. I have installed all necessary file like gitBash for windows , Jekyll , Octopress ,RubyGem and even DevKit. I can see my blog preview using 'rake preview' and its coming completely fine as it should. Also 'rake generate' and 'rake deploy' worked fine on gitBash and gave me a positive reply.

Am unclear with 3 things:

1. Do i have to copy my _deploy folder to github repository.
2. Getting 2 error on GitBash: 1.Change machine code to 65001(For which i have used chcp 65001 on cmd) 2.Permission Denied on public key when using rake deploy command.
3. Also i see a ruby gem error sometimes like Polling for changes and then i have to use ctrl+C to get out of terminal I can give you many links for tutorials too but if there's any one who can help me practically socially;p then it will be real help.

Also when am on my source folder from gitbash i typed git push -u origin master am getting following two errors.