ね at the end of a sentence asks the listener to agree with you. English does the same job with "isn't it?" or "right?".
Use it for something the listener can see or feel as well as you can. The usual reply agrees, with another ね.
ね is for what you both know. よ is for what the listener does not know. A cold day you are both standing in takes ね; the time of a test the listener has forgotten takes よ.
ね needs something the listener can agree with. It does not go on a fact about yourself that they could not know. Asked where you are from, ×カナダから来ましたね comes out as "you came from Canada, right?". Answer with the bare sentence.
ね also checks that you have something right.
These go beyond agreeing about a fact.
After ~てください or ~ましょう, ね makes the sentence friendlier.
In plain speech ね follows the plain form. A noun or a な-adjective usually keeps its だ; without it (きれいね) the sentence sounds softer.
よ and ね together check something you are fairly sure of but want confirmed.