Shop Talk: The Newsletter

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I'm at a loss.
My website features a newsletter sign-up, and since it has been there I have 2 subscribers + 14 family members that I signed up against their will, so they could forward some to their friends.  With that in mind I have found myself at a cross-roads, I'm somewhat feeling like, what's the point??

Plus, every time I sit down to really make a newsletter I am a complete blank slate!  Should I make a newsletter plan, should I have planned campaigns only??  I suppose I need to find some purpose and function before I run with the seemingly great idea...
I just don't want people to be signed-up and than one day out of the blue they get a newsletter and it's been so long that they don't even remember subscribing!

I suppose this must have just been a rant to myself more than anything.  I need to get up and get moving!