If you're gonna buy a set, look for a set WITH filmholders. Buying filmholders seperate can be rather expensive. And if you buy an old model wooden camera you might need special model filmholders, that may not be available anymore. So check this first before you buy.
If in doubt, ask on the forum: http://www.largeformatphotography.info/forum/forum.php
You can also browse this forum first to get an idea what is out there and what to look for.