Get yourself a collection of good ads and DM pieces and read them aloud and copy them in your own handwriting.

Handwriting great copy is best way to improve your copywriting skills. When you come across my copy or someone else's effective copy, especially a control piece that is working for a period of time, hand write it, word for word. You will be exposed to the writer's thinking process. You'll also gain a deeper sense of how ideas should flow to a logical
conclusion.

After a while, you get a feel for the copywriter’s sense of style, pacing (you can only learn pacing by doing it), and methods of structuring a sales pitch. Yes, it’s tedious. And yes, your hand WILL likely cramp up. But it’s well worth it.

Copywork is the fastest and best way to become a better writer. But for some reason very few people know about it.

If you want to learn how to write great ads…
Then part of your daily routine should be to transcribe great (read: proven) headlines, subheads, bullets, sentences, paragraphs, and even entire sales letters over and over and again.

By simply handwriting out the exact ad he made, I was able to “get in his head” and learn indirectly from Gary Halbert on my own time. I started noticing small details like: How he indents his paragraphs. How he uses extremely simple words. How he asks for the sale “without” really asking. How he uses punctuation. How he starts his letters with an address and phone number. How he finishes his sales letters with a P.S. How long it takes to simply write out one letter.
….and much much more….

... if you want to master the art of copywriting and stand out among your peers, you must develop the sorts of skills that can only be absorbed by internalizing those from the works of the masters.
... reading masterful copy aloud is a sound approach to internalizing these skills. Typing adds a bit because the memory is stored in two dimensions: aurally and ‘digitally.’ And handwriting masterful copy might be even better than typing simply because it requires more neuro-physical activity than typing.

Writing out a control by hand works in several ways. The longer the letter the better, because you actually see the little nuances throughout the sales letter … the choice of words the writer used, the transitions from one thought to another, one paragraph to another, you understand how the golden thread is woven through the letter.