I did this with a flat I owned years ago. There are some things you need to be aware of.
Check with your Local Authority if they require you to register as a Landlord.
You need to get a gas and electricity safety certificate for your central heating / electrical installation.
You need to inform your mortgage provider that you intend to let your property.
You will be required to declare any earnings for tax purposes. There is an allowance for the money you can make before tax applies - and it is only the pure profit so you can deduct your running costs / mortgage etc. Check with HMRC for the details. Also be aware if you don't live in the property for a certain length of time, then sell it, you will be liable for Capital gains tax. I think it is seven years.
You need to let your insurance company know. Although your building's insurance should be ok, you will need a landlords policy for any contents. And any tenants will need their own insurance to cover their own belongings.
Consider using a letting agency. They will ensure that rent is collected properly and will keep an eye on the place with regular checks. Most offer differing levels of service depending on your requirements. I think I paid about 8% of the monthly rental. Certainly if you are moving somewhere far from the property it is very useful. Also they will have standard leases which they can use and they should vet potential tenants properly.
If you go it alone, ask for references and check them. Take a security deposit and a months rent up front. I put the deposit in a savings account which had a months notice period on it. That way it was always there when the tenant moved out.
Take anything you don't want to lose, out of the property.
Ensure all utility bills are in the name of the tenant. That way they can't come chasing you if they don't pay. I did a standard letter, which when the tenant moved in, I got them to handwrite their name on and sign at the bottom, and I posted it myself.
If the property sits empty for a period of time, you will be entitled to a reduction on council tax.
There are probably a million other things, but these are what springs to mind.