You'll need to include more than a basic level of development and calculation in your spreadsheet. There are lots of free spreadsheets on the web. Most of which are very simple and easy to build. People aren't going to buy a spreadsheet that they can get for free. Take yours to the next level by adding all the value you can imagine. Then research on how you can offer a little bit more on the development and functionality side.
In order to ensure that you are provided with high-quality spreadsheet solutions and that they are 100 percent compatible with the profile and size of your business, you need to possess performing, state-of-the-art spreadsheet programs. However, it is important to note that the entire process of designing and creating your own spreadsheet solutions by using spreadsheet-generating programs is time consuming and requires a good level of expertise. Without the help of a specialized team of experienced programmers and mathematicians, the process of obtaining efficient spreadsheet solutions can be very challenging.
You'll need to develop good marketing material. Things like demo videos, which you can find plenty examples on YouTube, screenshots, and keyword rich descriptive text help people find your spreadsheet and communicate the value that sets yours a level above the rest. Excelville.com actually allows you to upload your spreadsheet with all of this marketing material in an easily searchable and user friendly website.
You can also create a calendar with a spreadsheet application and keep it within your budgeting workbook. You can list dates bills are due and you can also use the calendar in accordance with your budget to plan for special items or vacations. Having everything in one place will make it easier to manage your finances and plan for the future.