Hi @Sridhar Venkatesan , welcome to the Atlassian Community and thanks for your post.
You should be able to create a space and limit who can view it by granting or not granting permission.
Further to this, at the page level, you can impose restrictions https://support.atlassian.com/confluence-cloud/docs/add-or-remove-page-restrictions/ .
Please have a look at this documentation and let us know if you have more questions.
Best wishes
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