Well first of all, he is adorable!! Hard to tell what breed but he has some Harlequin coloring.
Adult males have balls, females don't.
It's very possible that he was dumped from Easter. Lots of people don't realize how much work they are and that they don't always like to be cuddled or picked up. So, when the kids get bored of it the parents don't want to deal with them to they "set them free". It's a good thing you found him when you did. Most rabbits don't survive more than a few days out in the wild.
I really recommend keeping him inside rather than outside. He'll be a lot safer, have more space, won't get as hot, and have more time to bond with you so he won't be so lonely.
Rather than using a cage or a hutch (which are very pricey yet small) I suggest using a wire dog playpen. These provide plenty of space for all his needs while still leaving space for exercise.
Keep him in a room where other pets won't have access to. Somewhere quiet is best. Give him some time to settle in.
Some basic things you'll need:
- Unlimited fresh timothy hay. Rabbits diets are made up of 80% hay, so having this available at all times is important.
- Fresh water. Rabbits drink as much as a large dog, so providing plenty of water will help keep them hydrated and healthy
- Toys. Rabbits are smart and playful, and they need something to help wear down their teeth. You can make DIY toys out of cardboard, paper bags, and paper towel rolls
- Hiding spots. Rabbits are prey animals and need comfortable spaces that they feel safe in. Cardboard boxes work well. They also like having multiple entrances so they don't feel trapped
- Litter box. Rabbits can be easily litter trained just like cats. All you need is a large cat sized litter box, big enough that he can turn all the way around in, some litter (don't use cat litter since it has clay which will kill him if he eats it), and lots of hay (since rabbits eat while pooping). It really helps to get them fixed though.
- A comb. Rabbits need to be groomed regularly. Though they groom themselves and are very clean animals, it's important to get out all the loose hairs. If they ingest too much hair they can't spit up a hairball like a cat, and the hair will block their GI tract which can kill them within 24 hours.
Things to avoid:
- Cages. These are way to small, cheaply made, and over priced. You can get a playpen for less than half the price.
- Hutches. Have all the same problems as cages and they often have wire flooring which will hurt their feet since they just have thin fur on their feet.
- Water bottles. Many reasons not to get them. They are very hard to clean, the nozzles don't let enough water through, it's an unnatural way to drink and it will hurt their necks and spine.
- Corner litter trays. These are made to fit into small cages. Most rabbits cannot turn all the way around in them and you can't fit enough hay in there. Rabbits spend a lot of time in their litter boxes, pooping and eating, and these small things just do not work.
- Bedding. It's really just a waste of money and if you were to put it all in the bottom of a cage your rabbit would use the whole thing as a litter box. And they'll have to live in an area with their waste everywhere. Just avoid getting bedding all together. If you want, you can use it in the litter box but that's all its good for.
- Treats with dyes and seeds. Most pet stores will sell these bags of garbage for small animals. It's like junk food. Treats such as apple, carrot, and bananas slices are a much better snack.
I recommend taking him to the vet. They can sex him/her for you, may be able to tell the age, and check for any health issues. I would also ask to have his nails trimmed if needed.
Rabbits make great pets but they are a lot of work! If you don't think you can care for him at the time then finding a home where someone could dedicate their time to him would be great (assuming he has been dumped).
Most rabbit rescues are great at finding homes where the adopters know how to properly care for rabbits.
A lot of animal shelters will take in rabbits too.
Most of the time, both shelters and rabbit specific rescues will get them fixed too.
Or you could rehome him yourself. Take the time to find the right people though. Most people just want a new toy for their kids, who can't even care for themselves.
And if you can, pass this info on to the next owners. There is a lot of misinformation about rabbit care that will end up hurting both the rabbit and owners.
Good luck, and I hope this helps!