You have a few choices. In case you are a paid business, depending on the product you can sell it online as well. For free businesses, you can list your products or services and generate enquiries. The procedure is almost same except for a few differences.
To add item, click on Manage Store on the left side if your dashboard. Here you have 2 choices, If item is already existing in Vconnect you can simply add you price and some basic details and make the item live.
In case the item that you are looking for is not available on the platform you would need to provide some details and it has to go through the quality check process
Please refer to here for steps involved in cataloging an existing item.
Click here for steps involved in cataloging a new item.