BCI does not charge its members for anything, and there is no obligation to contribute. Depending upon how you decide to develop and manage your website, you may have to pay for software, but BCI does not sell software. Using tools which are available on the internet and with your own operating system, BCI makes it possible to create and publish a website at no cost. You don't technically need to do this. This is easier to read, easier for people to remember, and easier for you to publicize.
Letter case is important.
Windows users should pay particular attention to this. As often as you like. You can upload all your files or only the files which have changed, as you prefer. There are several guides available on the web itself related to HTML authoring. Books are available at any good bookstore or computer store.