I would have a read of this for starters:
Making payments with an implant
The NExT has a HF and LF side so it is a great starter chip that covers many use cases but for us to advise you we would need to know more about your work and/or school systems.
The forum is full of great content, I recommend having a read through the wikis to start off.
Maybe starting here:
WIKI - BEGINNERS GUIDE to implants & becoming a cyborg 