Rabbits really don't like being picked up, so I only do it when necessary. To make friends just sit down nearby and let him come to you. Feed him a treat when he's close. Touch him on his forehead and the base of his ears, approach from the side as they have a blind spot just in front of their nose. Avoid his hindquarters until you're better acquainted, stick to the front end. Avoid feet I've yet to meet one that likes having their feet touched.
He really really must have a friend. This isn't optional. If you've space for one, you've space for two.
Have you registered him with a vet? He'll need a vaccination against myxi/VHD and you can book him in for neutering too. (I get mine microchipped whilst they're under the anaesthetic.)
Once he's neutered, start looking around local rescues to adopt a friend for him. Ask if they'll bond them for you. (Rabbits are territorial and must be introduced carefully. Don't just put them together!)
Are you savvy about good feeding? Lots and lots of good quality feeding hay (buying in bulk online is cheaper than PAH). A tablespoon of pellets not muesli (eg, Science Selective is a good brand). A handful or two of green veg. Go easy on pellets and veg, as the hay must be the bulk of his diet. Rabbits teeth grow incredibly fast (2-3mm a week) and eating hay keeps them trim. Dentals are expensive and stressful.
And finally a rabbit not eating is a vet emergency. Please go to a vet urgently. It's not like a cat or dog where you can leave it a few hours to see how they go on. A rabbit not eating is a sign something is seriously wrong. And not eating in itself leads to GI stasis which is very painful and can be fatal.