Ask How do you create a members-only blog for membership site?

[SuperAffiliateX]

I want to share exclusive content with my members but I'm not sure how to set up a private blog. Do I need a special platform or can I lock certain posts on a regular blog? I also wonder how to keep it secure and make access easy for members. Should I send updates by email or use a notification system? I don't want members to lose interest. What's the best way to create a members-only blog that keeps people engaged?