12-14 points
Open 1NT
15-16 points
Open with a suit bid and rebid in no trumps.
This might be 1NT or 2NT depending on partners response
17-18 points
Open with a suit bid and rebit with a jump in no trumps. This might be 2NT or 3 NT depending on partners response
19 points
Open with a suit bid and rebid with a jump to 3NT
20-22 points
Open 2NT
23-24
Open 2C and rebit 2NT
25-27 points
Open 2C and rebit 3NT
28-30 points
Open 2C and rebit 4NT