Hi, we've rented our house out in the uk and so far things have been ok. Things to consider are, landlord insurance incase of non payment by tenant, telling your mortgage provider that you're renting out the property ( they may increase your mortgage rate for this ). We're with halifax on a fixed term and because it was fixed they didn't increase the rate, but be sure to tell them as it could affect the insurance incase of a payout. Try and find a recommended estate agent, and one that won't charge a stupid rate. Around 10-12% is fair. There will be set up fees and renew fees every 6 or 12 months. A gas safe certificate is needed and and safe electrics, although we were told it didn't need a full electric test but a new or up to date trip box is a good idea. Also, you will get taxed in aus for the rental income so make sure it's divided between 2 if you can...husband/wife. We've only had to call the agent a couple of times so far so we're quite happy or lucky!!
can't think of anything else at the the mo. Hope that helps.