In what suburb do you live? Where do you plan to get ceritified? In Hinsdale? I recently opened a studio in a suburb of Chicago as well. First (I was certified), I began in my home and worked for about a year building clientelle in mostly mat and some equipment (reformer and chair). I saw there was a need for this in my city and opened a studio. I too sent out letters/packets to chiropractors, etc. I also joined the Chamber and introduced myself to all the business owners (specifically female-oriented) and put discount cards (one :30 complimentary session before "x" date) in their shops about 2 months prior to opening (clients could either do this at my home or at the new studio location upon opening). We offered to do a session with a editorial colomnist in a local paper who then wrote about us in the paper.
Many people in suburbs do not know Pilates includes equipment. Many are shocked at the cost of weekly sessions. I also worked in Chicago at a studio and there we had few mat classes because they were offered at many gyms there (obviously). Here they are more difficult to find (especially for free) and are typically not great instructors or are PIYO classes. Thus, we offer several (6) to accomodate schedules (moms, workers, etc.). This has helped build our equipment classes and offers an inexpensive option to people who want to do Pilates two or more times a week and can't afford private sessions. So, ask around, meet with some of the other business owners and get their input.
You'll need to figure out how many clients you'll need to have on a regular basis to pay your bills monthly. For us, doing this with the clients built before opening (in my basement) was the answer. So, going in we knew we could pay bills. I also have a partner. This is essential for me as I am a mom (as is she) and it helps tremendously to have someone to fill in for you. I also taught a class at the local health center to build some additional business for my studio; and at the other locations as well.
I would consider - is there at least one other person who could get certified - at least in mat. This would help you out. Are they willing to work for next to nothing as you build? The other great option would be getting space with a Chiropractor, Podiatrist, etc. Hook up with the local cycling or running club. Start with one reformer and a chair, some space for a mat class of about 10 people and build from there. Offer discounted options while you're getting up and running - like the "bring a friend" idea. Tell some people to get five friends together and you'll build a class for them with a 12-week (or whatever) committment. Look for local dance classes for kids, moms groups, school district meetings, bunco groups, churches. We did some mat class offers at several benefits in the area to also get recognition. This was a tremendous help in building clients.
How are the mat classes attended in your local gyms? Are they good? Do they charge extra at those gyms? Who is teaching the Pilates classes there?
Keep in mind, you will most likely (unless you can share space with someone or you are independently wealthy) have to get inexpensive space which is not street level (some cities do not approve of this in zoning even because you are not "retail"). This will bring you to an exposure issue that will force you to get the word out even more. Word of mouth is BY FAR the biggest seller. Realestate agents, etc. Hook up with someone that knows everyone and give them some sessions and get them hooked!
Suburbs are different than larger cities (having worked in both teaching Pilates). You'll need to show that ANYONE can do Pilates - not just pictures of perfect women in a teaser. We have photos of men and older women in our advertising and this has helped as well - of course we do have one or two perfect bodies! :)
Good luck! I've written a lot because I'm excited for you. It's fantastic and you'll be LOVED by your clients bringing this amazing form of exercise to your suburb. It's so fullfilling and so far so good with me and my partner!
Last thing - get certified by a very reputable certification company. Obviously Peak is great... I am certified by Power Pilates. DO NOT go cheap. You will be isolated and do not want to be in a room alone with some who has recently had a hip replacement and you are not absolutely positive on what to do with that client. You'll get all kinds of clients from *** cancer (and its side effects) to loss of limbs. So, be kind to yourself and go with a great program!