Only write about the features if they enhance the value of the benefits in some way. Copywriting is not as difficult as some people try to make out, but it does require thought and research to really engage with your potential customers.
Always, but always, concentrate on the benefits of your offer rather than the features. However, exciting or impressive you may find the features of your offer, remember that the readers want to know whats in it for them - in other words how will it benefit them.
Copywriting is the term we use for any writing contained within our marketing, wherever that may be. A bit of research on the internet will produce many sites, reports, eBooks, etc. offering advice on how to produce copy for an internet business. Some of this advice is produced by experienced marketers and copywriters but a lot of it isnt. If you can find information from a quality source you can certainly learn from that and acquire the skills you will need. There is always the option, especially if you are new to the business, to "outsource" your copywriting through companies such as "Fiverr" or "Upwork" which will cost very little. However, it is a good idea to learn the skill of copywriting so you can produce your own content, articles and sales letters.
First of all, you are not writing a novel. I love the work of Charles Dickens but he would have made a lousy copywriter! All copywriting needs to be pithy and to the point. Avoid flowery language and lengthy explanations. Remember, your reader will usually have a very specific idea of what he or she is looking for and will be asking the question when faced with any copy: "Whats in it for me?" Always try to anticipate any particular questions your readers may wish to ask and answer those questions in your writing - before they ask them. Think from your potential customers standpoint all the time. Unless you have a particular experience you feel you need to share to reinforce the information you are discussing, keep the words, "I", "Me" and "My" out of your writing. "You" and "Your" are the words to use; this is not because your readers are selfish, but because they are looking for something very specific to fit their own particular needs.
I am not going to try to give a comprehensive review of the whole copywriting gamut within this one article, there is neither the time nor the space. However, here are a few bits of advice which are well worth considering when you come to write.
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