We're abroad with the Armed Forces, and we rent out our house.
I let unfurnished (needed my furniture and gubbins here), and on the advice of my Managing Agent, without white goods as well.
Tenants pay rent, and all the utility bills and contents insurance for their stuff. I pay maintenance of the house, plus property insurance - DON'T go with Letsure for this - their premiums have rocked up. I found another company who do the same cover for half the price - saved £400 on this last month.
Financially, for us it works. The rent doesn't cover the mortgage, but that is paid out of salary anyway, and if we needed it to, the rent from our house would cover the cost the MOD charges us for the hiring here. I use the money to make improvements to the house, and pay the bills. You offset payments you make such as mortgage interest, insurance, maintenance (chimney sweep/gardeners/cooker and boiler servicing etc) against the rent, plus the Letting Agents fees. I don't pay any income tax on my rent. On paper, I make a loss each year, but the mortgage is paid irrespective of the rental income anyway.
We informed the mortgage company when we remortgaged that we let it out, but as we are Forces, they didn't object (I don't think many do for us), and the mortgage is not a buy to let, as we plan to go back.
Do get an agent - mine is worth her weight in gold and chocolate. She inspects regularly, sorts most things out for me, and is a complete star. She scares me rigid (like a very good headmistress would), so probably has the same effect on the tenants.
We rented ours out because I don't want to buy in Brussels, and plan to return to Cornwall when dh leaves the Services. We keep a toe hold on the property ladder, and have our property looked after. We have nice late middle aged tenants who get on well with the neighbours and love the house and the area. It works all around for us. The house has been let since November 06 when the decorators had finished, and we had I think, a couple of months when the house wasn't let. These tenants have been in since August 07 and want it long term, so touch wood we are OK for the moment.
Good luck!