Hi, Come prepared and do the homework first. Visitors are required to pay $25 BZ to Immigration and have your PP stamped each thirty days to stay legally. You must be able to sustain yourselves during your stay, you will not get work without a work permit.
There should be no problem finding a space to rent for that long. Better to check out all the Belizean websites and check the guides. Generally you will be happy here as long as you can take care of your finances and break no laws.
Good luck and may we meet in the future!