Much of the considerable power of OmniFocus is found in the concepts you either don't understand or feel that you need. Given that, it probably isn't the right tool for you. Contact Omni support within 30 days of purchase and get a full refund.
You might read the OmniFocus and GTD white paper before throwing in the towel:
http://www.omnigroup.com/ftp/pub/sof...dOmniFocus.pdf