For wordpress related themes have a look here : http://themeforest.net/category/wordpress/nonprofit/churches
you can easily customise colours on some of the themes on there ( some of them will have an option in the admin panel to do that ) . If you pick a responsive theme then it will work on most mobiles and tables.
Good luck with sales you guys. Google Suggest ( US based searches ) shows up the following suggestions
- adobe muse templates for photographers
- muse templates portfolio
- muse templates photography
- muse themes portfolio
I would love to see some items around photography and portfolio niche.
This should cover all the basics : http://codex.wordpress.org/Using_Themes#Using_Themes
I think the table wp_postmeta usually stores the meta data from posts .. you can have a look in there.http://codex.wordpress.org/Custom_Fields#Implementation_Details
Guess you already got it, if not : http://themeforest.net/item/angular-responsive-portfolio/1415600
Some top tips I can give you
1) Keep WordPress and your plugins updated to the latest versions.
2) Use this http://wordpress.org/plugins/better-wp-security/ ( provides most of the basic options )
3) Monitor file changes on your server using something like this : https://www.codeguard.com/
Since you are already hacked you could use something like this http://sucuri.net/ to start cleaning up the mess. Good Luck