One downside with using internet advertising only is when a business is just starting up, there are not going to be many customers that will find your site immediately unless they are looking for a specific product.
With some local newspapers, if the business is something unique to your town/village then it may be featured in the business section and this will most certainly provide some feedback from the local community.
Always ask when you are ready to commence trading because whilst it will cost an initial outlay, the benefits overall could be endless.
Top Tip: Getting the local press to help promote your business will overall help greatly so speak to your local paper as soon as possible and see if they would be willing to assist you with obtaining new customers and building a reputable client base.