Become known any which way you can around the local airports, join the local EAA, join the local flying clubs, participate in FAAST, fly with CAP, join the airport association, volunteer to serve coffee at the next fly in, etc.
If you can find a curriculum you like, try to advertise a ground school class package deal, like $250 for class and books, and add an intro flight at cost for people who complete the class as a carrot/reward to increase your retention/success rate. You position yourself as an aviation expert and teacher to a group of students who have a strong interest and inclination to start flight training and it will help you develop your teaching skills.
The hard thing about being independent is you simply need to have access to an airplane. If someone calls you about doing an intro flight or starting lessons, you need to be able to schedule them right then while the interest is high. Get them on the schedule for a flight to occur within the next 48 hours if you can. Make it easy for them to get started. Before you can do that you need to have an arrangement in place to have a plane available and know its schedule and know what it's going to cost you so you can tell your new student exactly what it will cost. Charge them directly for the total amount and then you pay the FBO for the plane.... dont make them pay you, then the plane, then the fuel, etc.... too much of a hassle for a new student. Try to have a pre-set intro flight cost and know how long you'll fly and what that's going to cost you, so if someone asks "what's it cost to start flying", you answer "$90"... bam. It's up to you if you want to do intros at a loss thinking you'll "wow" them into taking lessons, personally I dont recommend it and I just harge them a fair price for .75-1.0 of dual, to set normal expectations. Dont undervalue yourself or undercut other people significantly (it's fine to charge a hair less if you're just getting started, you're frankly not "worth" as much, but dont offer $10/hour lessons if the standard rate is $40/hour where you are) you'll look like a fool to intelligent customers and other instructors.
Talk to FBO's and flying clubs and see what it would take to be able to instruct your own students in their planes. Because you're bringing in rental they might be cool with it and will add you as an authorized CFI on their insurance, but make sure you check first. Dont just show up planning to rent their plane for your students without their authorization or you're voiding their insurance and rental agreement.