Have you ever heard of a US medical school telling an accepted applicant "sorry, you're accepted, but we don't have room for you...good luck reapplying next year?" It's certainly not "common practice" - in fact, it would be virtually unheard of. Apparently, the same can't be said about nurse practitioner programs. The OP doesn't specify the program he was pseudo-accepted into, but from the sounds of it, it's more than likely one of the infamous NP diploma mills. When the admissions standards for these programs is little more than a warm body and a thready pulse, it's only inevitable that sooner or later you're going to have a surplus of warm bodies.
And unlike NP diploma mills who may give exactly zero fucks when it comes to arranging structured clinical training opportunities and preceptors for their
customers students (*cough* Walden *cough), US MD and DO programs, accredited by the Liaison Committee on Medical Education and Commission on Osteopathic College Accreditation, respectively, are charged with the responsibility of developing standardized clinical rotations at affiliated teaching hospitals and clinics. With rare exceptions (e.g. audition rotations/away rotations), medical students are simply not expected to be doing the legwork to find and arrange clinical rotations.
Hopefully, the OP has the good sense to realize that this scenario is a huge red flag and avoid this program like the plague. Frankly, given the numerous issues with NP education these days, we think OP should seriously reconsider wanting to become an NP in the first place.