here is how and what Ive done...
I was at my local hardware store and as I passed the BBQ section I saw a bag of Jack Daniels Oak chips. My mind started ticking,, I have used these chips in several beers now with good results.
how I did it, I brought one pint of water to boil , then add 2 oz of chips. in a safe bowl I microwaved an aditional 1 min. covered with foil and cooled. , I then added this oak tea with chips in the secondary and after a few days Id take a sample to see how it was changing it usualy takes about a week, . the results depending on amount can be from suttle to extreme, I have a porter now that was oaked and after 2 months in keg its fantastic. My Oaked AB has changed over time and also turned out great.
This is how I was told to use oak, It worked and I stuck with it less(1 oz.) is safe 2oz is my norm and 3 really brings it out. It will also depend on style of beer, lighter of course will need less..