You now have somebody who is using your products, and it is time to ask them what they think of these products. You can also ask for feedback on what they think about your store. You can ask them to log in to their account and leave some product comments. Alternatively, you could create the comments on their behalf.
I strongly recommend that you do not invent comments. Such comments are really easy to spot and obviously show the lack of integrity. This is not the path we want to start on, right at the beginning of our new business. However, filling out some comments on behalf of a genuine user of our products is probably fine.
The benefit of this is, you will again get to see how the process works, and just as importantly, your future customers will have comments to view. This makes your site look more established as well as being useful and reassuring to a customer for the purpose of making decisions.