many thanks for the information, in my case it did not quiet work for me( custom navigation) I made a mistake with one of the scripts and had to uninstall and start again.
What I did learn that may be of use to others trying to start their wordpress sites is that the "Original Home page" is the page where you enter your blog posts. Depending on your theme if you have deleted your test post then you may get the error 404 message or you will be told that the page does not exist.
Also important to realise is that this page never appears on the pages list in the Dashboard. The Home page that does appear in the dashboard is a page that probably most of us will want as a "STATIC" page and there are plenty of posts on how to do that. Hope that helps others starting out.
Now I'll try and figure out how to use the Custom navigation as the exclude pages plugin will not work on Studiopress theme.