Larry, here's what I've done with good result:
-I started with some charred oak cubes that I picked up at my Local Brew Supply store, and soaked them in Maker's Mark bourbon for a week.
-I then cooked up a nice amber ale, poured off the liquor from the oak to get rid of the excess tannins, and added them into my primary fermentation.
-At bottling time I added more Maker's Mark. For the 1st batch I used 1 cup bourbon:5 gallons beer, but that seemed a bit too strong. My current batch has 1/2 cup but still needs to bottle-finish before I can say more.
Hope this helps.