Complete, helpful, and appropriate Disaster Recovery Plans and Business Continuity Plans are definitely full time jobs, and they are two different documents. Most organizations have both, and it is probably best to start with the DRP. I recommend hiring someone to work on this process with you, since this is not a fly by the seat of your pants kind of project.
As a Contractor, I work on Disaster Recovery Plans and have a Certified Business Continuity Professional (CBCP)certification. It so happens I am available and looking for a new contract. If you are in the market, let me know and I will send you my resume. Or, you can go to DRII and access their list of other consultants. Be sure to look for the CBCP certification and both a process analysis and DRP background. Knowing CMM and/or ITIL helps.
The best tip I have for you is this: hire someone who has the background to do this and do it well, then give that person access to all your technical knowledge regarding the cost of downtimes and how the organization currently deals with incidents. The two of you will make a great team. Second tip: it takes time to do it right.
Let me know if there is anything else I can do for you. :-D Agent99inVirginia