Well old bean! Congrats. Find a teacher, because the pipes must be in good order to get the most from your wind, and you have to get in shape. Make sure the regulator valve in the blow pipe is working, and the bag is well seasoned. Bag pipes reads are of varring degrees of hardness, and though the hard reads are best for tone and action, you may want to work up to them. If all fails, try the Uilleann Pipes for a while, and the highland pipes will seem easy in spite of the bellows.
Good luck
Larry