Wow, he's so cute!!
Toys: It really depends on the individual rabbit. Try a variety and figure out what kinds of things your bunny likes
. Some basic bunny toy categories are chew toys (willow balls/rings, apple branches, pine wood toys, balsa wood, cholla, yucca, etc.), shreddable toys (cardboard boxes, brown paper bags, paper, "shredders" made for parrots, corn husks, grapevine balls, etc.), tossing/shaking toys (hard plastic baby keys, toys made for bunnies such as tossing rings and the "flip n' toss carrot", rattles, etc.), puzzle toys (Teach N' Treat, Bunny IQ toys from bunspace.com, SlimCat ball, boxes filled with hay and treats, etc.), hiding/climbing toys (cardboard bunny houses and mazes, wooden hide boxes, willow tents, tunnels, etc.), and rolling toys (hard plastic "roller" toys, balls, various cat toys, etc.).
Littertraining: It'll be much easier once he's neutered. I generally "train" them by offering multiple litterboxes in spots they like to hang out (or spots that they have accidents) and I also restrict their access to the house. You don't want to give too much freedom at first. Always put hay in the litterboxes (or in a hay rack right above/next to them. Bunnies like to "go" while eating hay, ha. A common mistake is using bedding in the cage (like Carefresh). It's better to have no bedding so they don't confuse the cage with the litterbox. Blankets/towels can be used, though, as long as your bunny doesn't try to eat them (some do, some don't).
Brushing: A flea comb or a similar type of fine comb should work
. If he ends up a lot fluffier let me know and I can probably make better recommendations...I used to have an Angora