Welcome Kirstie and Stanley!!
First off,you should have hay all the time.Since he’s still a baby,Alfalfa hay would be fine.But once he gets older,you should transition him to Timothy or Orchard Grass Hay.You should also have high quality pellets for him.My bunnies are still babies and I give the Oxbow Bunny Basics 15/23 which is alfalfa based(good for growing bunnies).Stanley might be too young for veggies.He needs fresh water everyday too.You can refer to Bunny Info page for more details about raising your bunny.
You should also have a place for him.Like a condo.Make sure he can move around in it.
About litter training,Binky Bunny forum will help you a lot about this.Give him a litterbox.The basic cat litter box will do.Put some litter bedding in it.I use Carefresh on mine since its really good at controlling odor.Put hay in one corner since bunnies like to eat and do their business at the same time.Confine him in a small place for now until he learns to use his litter box.
I’ll leave the rest to the others.
Again,welcome!!post some pics of Stanley if u you could.