Stephen,
I spent some time looking over your website. I love the graphics, and logo. To be honest though, it took me about 10 minutes of reading and picking through it to figure out if you actually had any airplanes or not.
Unfortunately, unless you work for a flying club that has a Citabria or other taildragger, it's really difficult to gain a reputation as a reputable tailwheel instructor without your own plane. It has much more to do with perception that actual skill.
I too was a free-lance tailwheel CFI with some solid experience, but really didn't get any business until I bought my Cub and folks started seeing me fly it around and how I cared for it. Then I started to create a niche' by getting requests for checkouts, BFRs in other people's tailwheel airplanes and ferry requests in everything from Citabrias, to crop dusters, BT-13s and T-6s.
People take notice, and you will gain your reputation by how other folks see you fly your plane and most importantly, how you maintain yours. If you fly a dirty, leaking piece of junk, that becomes your reputation. Conversely, if you maintain it well and fly it conservatively, potential pilots/customers will have some assurance that you will treat their aircraft the same. On a side note, other than meeting insurance minimums, this also one of the highly sought after foot-in-the-door "keys" to getting invited to fly for a museum. Right now I've got another 450 Stearman and AT-6 to fly for gas because I was in the right place and time to give the owner a flight review in both when he needed one because he saw me flying my Stearman locally.
There literally hundreds of relatively economical tailwheel airplanes sitting around the country in hangars for one reason or another, I'd think it wouldn't be too hard to find one to lease, if only for a season, just to see what it does for your and your business.
As far as marketing, I'm not a Facebook kind of guy, but my wife (er, administrative assistant) started a FB page for the company that I maintain and it has done well and reached demographics I could never have time to using conventional marketing. Plus, it alleviates me from having to make regular website changes to show customer feedbacks, news, etc.
I also spend a lot of time making to events and fly-ins where tailwheel pilots congregate. This is where I've generated much of my business and repeat customers. Good tailwheel CFIs are usually at a premium if by geography if nothing else. I get several calls a month "Can you help my smooth out my wheel landings in my Stearman, can I work with you for a couple of hours to get back into flying my Citabria, I need a flight review in my Decathalon / T-6". I also do a fair amount of formation /F.A.S.T. instruction but never charge, spending a weekend teaching in the back of a T-6, T-28, or Nanchang is more therapeutic than anything else. They also come back to you for their future training needs
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It only takes a little time to gain that trust and reputation as the regional "go-to" tailwheel guy, which depending on where you live, and if maintained is like gold.
With so many qualified and eager CFIs out there today, I think the tailwheel, spin, and aerobatics niche' is one that will never become saturated, and quite frankly is a lot of fun. Sorry for the long post, I think I've got most of the bugs ironed out after making several changes over the years (except 100LL prices), let me know if I can answer any questions.
Mike-
Silver Wings Flying Company, LLC
Olympia Regional Airport (KOLM)
www.Silverwingsflying.com