Mica, I agree with previous poster, I'm not sure what it is you want, either, but I think your very confusion (or lack of clearness) is your answer. You will need to spend some time doing some generalist nursing before you find out where you want to specialize and since educational endeavours should be built on a clearer idea of what it is you want to increase your knowledge in, I would say you are not yet ready for post BSN education.
When I graduated from nursing school, the common wisdom was to work some med-surg and get some broad experience and that is what I would urge you to do; that may mean general med-surg, general pediatrics (if you are inclined toward children and families), a long term care unit, a care home (if you enjoy gerontology, a true up and comer if there ever was one...). DO NOT feel compelled to specialize; it will come naturally out of what you do and enjoy doing. A large hospital can be a real benefit in that you can start on a med-surg unit or general peds unit(stay for a year or two to establish you knowledge base and work rep), transfer to an ICU or other department if that works. (You may find that first job is "it." I regard med surg as a formidable speciality...)
Anyhow, relax! Your first job is not the final word. It is the foundation of your future practice and not indentured servitude where you vow to stay "forever."
My practice started in a cardiac stepdown unit, to the ED, to a MICU, to ED, public health, case management and now substance abuse prevention (21 years).
Don't be in such a hurry to get beyond who you are (a soon-to-be new grad). Enjoy and learn from your present reality.