Hey mate. Think I could do this for you. I understand copywriting very well - know perfectly well how to connect to the reader NOW, rather than in ancient times when being salesy worked.
So, in my copy, I would - first and foremost - make sure to connect to the reader. I get their attention, I define the problem - thoroughly, to really make them understand I know their situation - present an amazing solution, which they feel is attainable FOR THEM (or they will never invest in it; right?), give them some reasons to trust that this actually works (here testimonials and scientifical backing is great) and then a strong call to action.
You said, the service should be explained well.
When doing so, it's absolutely critical that you - in explaining - also explain why it would be great for THE READER. So, if you name feature x, you HAVE TO end that sentence (if you can; it's ideal) with benefit y. So, "this has x which will benefit you in y way" is the way to do it.
It's a great formula which is authentic and powerful at the same time (and that has been used by some of the best copywriters).
Also, if you have a landing page - that you want modified - I could help you to modify it according to the guys who are the best in the world at it (they are called Strategic Profits).
Pm me the url and I will have a look and give some pointers to what should be done to the design; and some actual examples of how to change the copy.
Why not add me on skype; my handle is Sumon Hästö (give me yours if you can't add me), and discuss this. cheers mate.