Try this topic
http://www.aldorlea.org/officialsite/phpBB3/viewtopic.php?f=42&t=7062. But to make long story short - it's not necessary to burgle everything, you will get another chance in LF2.
As for buying the house, it isn't necessary either, I'm not sure if there's a trick for earning money with bunny races in Chapter 3, I've earned gold for the house and other thing by farming Heavenly dragon in Chapter 4 - it's 280g per kill I believe, let's say 6 kills/minute max, i.e. something like 300 dragons per hours (with pauses) = 84000g per hour which is quite doable (Plus you will lots of exp for doing so...). And you won't get any benefits from buying the house sooner, so I would wait for Chapter 4.