These Help pages can be downloaded here with the Winning Bridge Shareware game for Microsoft Windows 98, ME, 2000 and XP.
If you would rather read a book, take a look at the Acol Bidding page for some suggestions.
Acol Bidding - Responding to 2C
Remember that partner has not promised a club suit.
Points 0 - 7
Bid 2D regardless of any suit you might have or the shape of your hand.
Points 8+
Bid your best 5+ card suit or 2 NT with a balanced hand.
After a positive response a game contract is virtually certain and a slam is possible (with 10+ points in your hand then a slam is probable).