Kittens are so easy to care for! I have included an article below that will help.
Litter box training is usually learned within a day or two. Just put Ares in the litterbox several times throughout the day. They usually figure it out quickly.
Make sure he has plenty of toys to play with and tall scratching posts. They like to use the post when you are around as a social behavior so try to put the post near a common living area like the living room or bedroom.
He can have kitten hard food now and you can give him a tablespoon of canned food once a day if you wish. If he is a big eater, I wouldn't let him just free feed all day long as they will eventually become overweight this way. He should be eating about 1/2-3/4 cup of food a day right now.
I hope this helps and if you have any additional more specific questions, we would be glad to answer them for you!
https://www.petfinder.com/cats/cat-care/kitten-care-must-know-tips-for-raising-kittens/