Your site has some commonly used modules already preconfigured. These include:Image Module which holds the image beneath the menu. This is a Custom module that you can edit to change the image.Most Read Posts which lists articles based on the number of times they have...
Your home page is set to display the four most recent articles from the blog category in a column. Then there are links to the 4 next oldest articles. You can change those numbers by editing the content options settings in the blog tab in your site administrator. There is a link to your site administrator in the top menu.
If you want to have your blog post broken into two parts, an introduction and then a full length separate page, use the Read More button to insert a break.
Here are some basic tips for working on your site.Joomla! has a 'front end' that you are looking at now and an 'administrator' or back end' which is where you do the more advanced work of creating your site such as setting up the menus...