Fix spacing for Joomla website Home Page & convert asp to PHP

The website uses Joomla version 1.5.2. There are 3 panes on the Home Page. Pane 1 on the left is the main menu with green background. Pane 2 in the middle is a table with articles. The articles are stored in the external database outside of Joomla. Pane 3 is on the right and has a list of links. The links are stored in the external database outside of Joomla 1. Panes 2 and 3 need to be converted to Joomla. 2. As a result of the conversion, Pane 2 should be expanded horizontally and vertically to use up more of the valuable blank space on the screen. Any information that does not fit on one page is currently truncated. 3. Panes 1 and 3 should be extended without limitations. I would like you to tell me which steps you would take to implement this.