You chose to bid 3 No Trump. This is correct You have supported your partner's choice of bids, and showed him at least 4 points.
The bidding will now go No bid, No Bid, No Bid, and the Contract is 3 No Trump to be played by North.
The opening lead is made by East. Here is his hand.
44. Remembering the suggestions for leads against a No Trump contract, what should he lead?
a. Ace of Clubs
b. 3 of Spades