You don't need much. Basically just a bed, collar, lead and name-tag, plus food and water bowls to start with. I would also invest in a bottle of enzymatic pet accident cleaner such as simple solution just in case it takes a day or so for him to work out where the back-door is in your house.
Name-tags have to include your name, address and postcode. There's no legal requirement to include the dog's name and some people prefer not to and no requirement for a phone number, although it's obviously necessary if you want the dog to find it's way back to you should you get separated.
BUT, if you want to go shopping ...
First of all find out if he's been crate trained and decide whether or not you want him to use a crate at home. If you do, I'd recommend having a look here. They're very reasonably priced and we bought our pup's crate from there.
If you aren't using a crate, pick a nice comfy bed. Lurchers like their home comforts so the comfier the better. Cushion/Mattress styles are popular, but lots of people start out with a folded duvet to start with and get something more permanent when they work out if their dog is stretcher or a curler, iyswim. Mine have both. In the kitchen we have traditional plastic dog beds with memory foam matresses and various blankets and fleeces for them, in the living room they have soft beds.
He'll probably come with a collar, but you could get him a new one if you'd like. Lurchers tend to have quite small heads, proportionally to their necks, so either a fishtail greyhound style one (Lurcherboy has one of those) or a martingale would probably be best to prevent the collar slipping over his head. There's an amazing array of sighthound collars for sale and be warned, collecting them can become addictive. 
You will probably want him on a long-line to begin with until you're sure he will come back when called. Flexi-leads aren't recommended, instead a long webbing line like this or even longer, attached to a a harness is preferable. It's not a good idea to attach a longline to a collar, as they can damage their necks if they hit the end at speed.
The rescue centre will advise you re food and it's usually best to keep them on whatever they're already getting for a while, before gradually changing over.
Toys. Not all sighthounds like toys, but mine both like tuggie ropes and plaits, frisbees and balls. You're absolutely right about annoying squeaky toys that will get ripped up in the first 5 minutes. It may be worth getting a kong to stuff with tasty food for when you have to leave him, as it's a great way of getting them to settle while you're not with them.
Really it's possible to spend as much or as little as you like, although personally the temptation to shop for my dogs is always a little too strong. 