And not trying to be pedantic but the tour start is in Ghent instead of Bruges.
IF you decided to go to Ghent directly from the airport there are trains that take under an hour. Some have a change in Brussels, some don't. Some are milk runs so take closer to 1.5 hours. The fares are inexpensive (under 20E) and do not need to be bought ahead of time so no worries about timing a train for when your flight arrives.
I like Ghent much more than Brussels (have been to both a number of times) as it just feels more, uh....Belgium, lol. There is plenty to do in Ghent for an extra day and a half. Brussels is more cosmopolitan to me - a big European city. IF there is something in Brussels you want to see, then by all means, stay over there. If not and you were just looking for a place to be to get over jet lag, I'd go on to Ghent. The train station you want for Ghent is Gent-Sint-Pieters.