If you have created an Internet Family Tree from the EasyTree Internet menu without altering any settings, the Tree should contain everyone in your family file.
You can view the Tree by clicking on the wc_toc.htm file in the folder that was created for you when you created the Internet Family Tree. That folder may be called something like "report 001, internettree" unless you chose a different name, and that folder should be in your Sierra/Gen8 folder. When you view your tree using this method, does it contain all of the people?
As for uploading the tree to a website using the Web Publishing Wizard you need to know the relevant information that your ISP gives you if you already have some free webspace provided by your ISP.
An alternative to using the Web Publishing Wizard in EasyTree would be to use a program like the free WS_FTP to upload the Internet Family Tree to your destination.
Another point to consider is that your old Sierra v8.0 is not Windows XP compatible. You may wish to upgrade to the latest Generations v8.5a which is XP compatible.