Nintaijutsu would be using that chakra in a way different than simply channeling it, like the Raikage's armor is a lightning release technique yet it can be considered nintaijutsu due to it's uses. If you're just channeling chakra, then it's just chakra enhanced taijutsu. Adding elemental chakra to it however is nintaijutsu. I hope I explained it clearly.
Good, then I assume you've covered kunais, shuriken and the various other ninja tools?
Before we continue, on NB taijutsu can be broken down into two main categories: Jutsu form and freeform. The first is widely used and learned in training sessions whereas the second is steadily rising in use and can only be really learned through application. In this training session, I'll try to help you learn how to use both as best as I can help.