A couple ideas for you:
-On looking for work out of state:
Many employers seem to overlook out-of-state applicants, at least they'll call the local guys first. In order to help there, I'd get a local phone number (at least they won't need to call you long-distance)- you can do that either through one of the online phone service providers (if you have broadband) or go down there and get a cell phone with a local number. I'd also consider getting a PO box in the area you will move and having the mail forwarded to your home, or alternatively use your in-law's address on resumes (a home address and not a PO box would probably look better). If none of these ideas are practical for you, don't worry- many people get out of state jobs without going through these steps all the time, it is just if you can do this it will be easier.
-On interviewing:
It isn't too big a deal, just try to relax. For tips your best bet is to get professional coaching if you are worried. The cheaper route, but very good (especially if you aren't too scared and need the reassurance of a one on one coach) is to get a couple books, or even check the advice found on some employment sites and the employment section of sites like Yahoo.
-On the lack of education/certifications:
First, experience is a good thing, stress your on the job accomplishments on your resume. Showing real accomplishments on the job should look better to most employers than education, especially if it isn't an entry level position. If you are worried, depending on your IT subfield there are quite a few certifications you can get pretty quickly, especially if you already know what you are doing. If you basically know it already, you can be a MCSE, CCNA, CNA, etc. simply by taking and passing test (I only noted networking certifications since that is what I am more familiar with, there are similar certifications for other IT areas as I'm sure you know, and many simply involve passing a test to get them). If you want a refresher, there are many training sites that have accellerated courses (sometimes just weeks or even days) for experienced professionals.
-When to start looking and other miscellaneous advice:
Start looking now. A job search can take a week, or a year. You don't know how long it will be so look now. If you get something early, you can either try to negotiate a later starting date, or if they won't do a later date and it is a job you really want, maybe you can move early.
One thing you really should consider, especially with years of experience, is a recruiter. They can help coach you on interviewing and resume writing. Also, since you'll be moving to an area where you have no networking contacts, they have them. I have a friend who is only 22, he only got his degree this year, and he's been in good jobs making good money (money that friends I have who are double his age don't make) for the past 3 years because he has used good recruiters. He's also constantly turning down new job offers, once on some recruiters' radar they'll keep looking out for you.
If you don't get something before your deadline don't discount temp/staffing agencies. I know nurses and lawyers who won't consider any other employment option (they like the flexibility). Some pay decently, and it will help while you are getting acclimated to the new area. Employers often use them as an extended interview, and you can use them to see what employers you like. Some of the better agencies may give you resume and interview coaching as well.
Last, relax. I know it seems scary, I know it is stressful, but you will survive it. You are doing something that millions of people do all the time, some without any choice in the matter (layoffs). You may even come out of it in a vastly improved financial situation.