You have different ways of getting to the same result, it depends what you really want to do. As Rama suggested, single pilot/plane is the easiest way to start, and then you can build from it, the paperwork can be intimidating, but nothing inpossible.
Another way is to star a flying school, pt 91, and then use one of the plane and the maint. facilities to "grow' To 135, while the plane still fly as a trainer.
You can put a plane on somebody else certificate, the fastest way by far, but you pay per plane/pilot and potentially trip, you depend on their`s Ops Spec, and if the FAA shuts them down you will have noo certificate to work with. Plus the Feds are becoming more strict about the definition of Operational control, so This it could go away in the near future.
Alternative, you can manage a plane for an owner. He ownes it, you put it on a certificate, when you fly the owner is under pt 91, otherwise you charter it and the owner take a cut of the profit of the trip, offsetting ownership costs.
The local Fisdo and the FAA web page are excellent sources of information for the topic in general!

Good luck

Sk3