it really depends how deeply you want to go into it. basically there are three approaches. 1. coding; 2, using a wisywig application or 3. a little bit of 1 and a litle bit of 2. Unless you are an experienced developer you wont be doing 1. A wisywig(2) application is simply an application that allows you to place things on your page without the bother of using coding. This is very simple once you know the tools of the individual application(I have never heard of WebsiteX5 but I suggest this is what it is).
Its a bit like using MS publisher etc.
However if you do not use coding your choice of what the page will look like is very restricted.
This is why a good wisywig will give you the tools to write coding if you want to.
If this is serious and you want to reach a lot of people and you want it to view properly in all browsers, and you want the look to be sleek etc and keep to w3 standards you need to be thinking about learing XHTML and CSS. If its just a couple a sites where you can hanfg your thoughts a wisywig is probably just fine