New Minor Forcing is an agreement after partner has rebid Notrump over your Major suit response. As it is completely artificial partner must alert. Here's what you need:
1) Invitational or better values (10 plus pts. over 1NT, Game Force over 2NT rebid).
2) Usually Five Cards in your Major or possibly five ♠'s and four ♥'s.
3) A slam invite in partners minor.
After "New Minor" opener rebids as follows:
1) Two of partner's major show's three card support and 12-13 points
2) Two NoTrump showing 12-13 points and only two cards in partner's minor, usually not five ♦'s if you opened a ♦ or four ♥'s if partner originally responded one ♠.
3) Three of partner's major show three card support and 14 points
4) Three ♥'s with four ♥'s and 14 points (Partner responded one ♠ originally)
5) Three NoTrump: 14 points no support or four card ♥ suit
Let's try a few.