You may not think of yourself as a copywriter, but I recommend that you study the basics of copy to make the most of your list.
Elements such as the AIDA formula will certainly improve the responsiveness of your list.
AIDA stands for:
This means capturing their attention, interest, desire, and finally having them perform the desired action.
What does this mean? It means you start off with a headline that grabs attention. Then you pique your subscriber's interest with a great opening line. You build desire with great content that follows.
Tell a story! That's always the best way to draw interest and build desire.
Finally, once your subscriber's desire is at its peak, you tell him to take an action.
It's really that simple.
I am certainly not recommending that you hold off on starting a list or growing your list until you're a highly skilled copywriter, but I do recommend that you continue to study copywriting to continually improve your results.
For examples of great copywriting, check out Copy Blogger. They have a ton of free resources that will help you write better copy.