Marketing on the Internet will require large amounts of research, test marketing and copy writing. It will require trial and error and not a little bit of failure. As time passes, if you stick with it, things will become easier. Just don't expect success to fall into your lap on your first attempt. If you find marketing a product on the Internet too hard, maybe the problem is the product.
Internet business is more avocation than vocation.
If you do not feel strongly that your product is the best of it's kind available, your marketing efforts will likely reflect this attitude. Look for a product you can love. While it is true that you should never stop learning, learning how to market a product on the Internet need not be a lifelong process. One of the great things the Internet has done is make information freely and easily available. Learn from others by reading articles available on web sites and in newsletters.