There is no specific trademark classification for opening a store or selling online. Because they are just some ways and means in business operations. It mainly depends on what kind of products you are engaged in or what kind of services you provide, then just register the trademark in the category corresponding to the product or service. For example, if you are engaged in agricultural and sideline products, you can just register a trademark in the corresponding agricultural and sideline products industry. It will not affect your store opening, online sales or franchise chain.