Is it a new barrel? It might be a good idea to run a few beers through it to strip some of the oak flavors, otherwise it can get pretty overpowering.
I got a freshly dumped rum barrel a couple of years ago. First beer was in there for about two weeks, and had a pronounced oak/rum flavor. Second beer was about three months, and the third was in it for 6 months. The oak was still pretty potent after 6 months of aging in the barrel, but not offensive.