BS in Biology to MSNursing?

Most places with MS in Nursing or MSN programs (which are different, but similar) are not set up to prepare you for the RN. You'll either need to go to a school that has a master's entry program of some sort, go to a school with an accelerated BSN for people with a bachelors already, or suck it up and go to a community college and get your ADN before moving on to get your masters.

As for becoming an NP - all NPs have at least a masters, but not all masters degrees in nursing prepare students for NP certification.

Being an EMT is impressive from an admissions standpoint, but may or may not be what helps get you in - it all depends on the admissions committee. You'll certainly fly through the first few fundamentals sections when everyone else learns to take vitals. Being an EMT will also be occasionally annoying, though, when you get told that you need to be supervised by a preceptor while in the hospital to do things you're licensed to do out in the parking lot.

Not sure where you are, but East Carolina University in Greenville, NC has an MSN program for non-nursing degree students.