Oak Barrel Aging Question

[NWOKBrewer]

First time post...apologies if this isn't the correct area. I didn't see any section for aging, so I thought I'd drop it in here.
I recieved an Oak Barrel from a friend at a local brewery in OKC. The brewery used it once to age one of their seasonal beers. I've had it for a few months in
my garage. My plan is to age some stouts in it....which leads to my question. What's the best process to get it ready to fill? Keep in mind that I received it with the bung in it...but there IS some of the beer still left inside. I would assume around 1 gallon. I was thinking about rinsing with hot water, dumping in a couple handles of Woodford, giving it a couple weeks (rotating on a daily basis), dumping and filling with beer.
Could someone who has done this before give me a bit of insight? Any risks with what I was thinking?
Thanks guys/gals!!!

 

[Lefou]

Barrel-aging is a new concept for me, too. It would be cool to age beer in one, but so far it's a bit out of my league ... but I can point you in a reliable direction.
https://beerandbrewing.com/barrel-aging-for-homebrewers/
...and ...
https://learn.kegerator.com/barrel-aging-for-beginners/

The sanitation and prep part is at the very bottom, unfortunately, and the article is geared for smaller barrels.