you can have one of your own free beers at the weekend...
after a few days in the barrel,[in a warmish place, no worries in this weather ]
then leave it outside over nite to chlll a bit,
it will be time to have a trial half to see how it tastes and if its carbonating ,...
this will give you an idea of the taste ..
it should be good......
look for any off tastes it may be a bit yeasty...
then it will improve with time,
there is no real science to the maturing,
some beers are great as soon as there brewed ,
[most pub beers are around 3 weeks old,
but they do have a lot of complicated methods to get their product done and sold,]
others beers are best when you drink the last pint
You should get at least half way through the barrel,
before it needs a top up of co2 ..or you may get away with using none at all, it depends on how much co2 the beer is producing...
good luck with the tasting