Fix Up Joomla 1.5 Business Directory Site

I've set up a business directory site on Joomla, using the Sobi2 business directory plugin, and need the site to be fixed up. I installed aceSEF as well in the hopes it would correct the problem (so far, it hasn't nad I don't demand that it be used). 1. Right now only the home page is formatted correctly. Other pages lose their formatting. This needs to be corrected. 2. I'd like it so it displays a default icon that automatically gets replaced if someone adds an image to a site. 3. Want it to be SEO friendly URLs. 4. Enhance the security of the site. 5. I'm using a simple template that I created on Artisteer (I am open to other template suggestions for a business directory, but I am necessarily asking for a customized template) Since this is a common issue with Joomla 1.5, it should be simple enough for a Joomla expert.