I started a new Yeoman angular-fullstack project (client-angular.js, server-node.js) (generator: https://github.com/DaftMonk/generator-angular-fullstack) I have 2 seperated directories for client and server, I want to launch the app but the deployment don't show any index.html file,
The question is, Should I make 2 different hosts for the server and the client? if no, how can I host and use the united projects?
No, it is not needed to create 2 different hosts for the server.
The server needs to point to app.js, usually located at server/app.js, as this is the entry point (instead of index.html) of your app. How this is done depends solely on the server you intend on using.
If you consider using IIS you can take a look at: Installing and Running node.js applications within IIS on Windows
As for the other deployment options, as laggingreflex said, "Heroku is the popular choice to host node.js projects". The angular-fullstack git site has more information on deploying to Heroku or Openshift.
As a side note:
Deploying to IIS requires a bit more attention than the information in the link specified. You need to set file access, create a web.config file as well as a few other stuff. At least, I had to...