The web is a wonderful place with lots of opportunities for development, especially if you have a little bit of knowledge and know how to apply it properly. The ability to write web applications can be a great skill that will make your computer related tasks so much easier, and may even lead to you sharing it with others who have the same needs.
The first basic step to writing a good web application, is to find a free template. The reason you are looking for a free one is because in the beginning you may not have mapped out all the details of what you want yet, and this gives you plenty of wiggle room. Even if the template you use isn’t perfect, and it probably won’t be, you have the option of modifying the code to your specifications. This can take some time depending on how familiar you are with the language that the template was written in.
There are many different web languages for designing applications, but by limiting yourself to editing and modifying basic code that others have written, you will be learning the language without burning yourself out and getting engulfed in the complexities.
Some form of visual software will come in handy as well, these can be downloaded for free if you look for a highly rated one. Your purpose is not to be a graphic designer, but you will still find yourself having to deal with the visual aspect of the app nonetheless.