There are thousands of themes to choose from, Free or Premium cost. In order to narrow down the choices, we will need to know what things (functionalities) you want your site to do; and then we can point you to look at those types of themes. Once that is sorted, you will know what to look for. Have a look at free themes posted on the WordPress website, or for a more sophisticated professional look, browse through Themeforest for Premium Themes.
Find at least 3 appealing themes and compare them; and then together we will select the one that best fits your needs. Webdesinz could also search for you, if you don’t know where to start.
Please be aware, that free themes are probably not sufficient for sites that are going to have lots of required functionalities.
Themes are added to a WordPress base install, (as are plugins too) – to give it unique structure, format, and layout. When you view a Demo Theme, try to imagine it changed to accommodate your company colours and graphics. We can change colours and remove unwanted dummy sections, to tailor it to your needs – however the structure/layout will remain same as as it is displayed in the demo.