If you are undecided whether to do inside sales or outside sales for your business, here's an article that can help you see the differences as well as the benefits of doing inside sales or outside sales for your business. Inside sales is when a customer comes to you at your fixed location of business while outside sales is the opposite. After you have read it, you can decide now which path to take.
According to my personal opinion without marketing every thing is almost useless. First you should decide that what kind of products and where you want to sale your products. Its all depends on your products quality, if your products are good and having good market then, surly inside or outside both sale will be good itself in future.