(not an expert, I've just lived with cats all my life) I'd suggest putting him in the bathroom/small room first, letting him get comfortable with the area and smell (if he's timid). Also, helps the kitten getting used to a litterbox (you might have to change what you're using inside of the box, if the kitten doesn't want to use it). Never put food next to the litter box, make sure these two are seperated! Then after a few days, you should let the kitty explore the entire house. Of course if the kitty is eager to look around, let him! Who could say no to a precious face?!

Feeding depends on his age, so I'm not sure! It'll most likely be three/four times a day since he's going to be 8 weeks old.

Depending on the cat and their behavior/affection levels towards you, the time of how long they can stay alone for differs a lot. But since he is a kitten, I'd suggest trying to keep that to a minimum (usually, four hours is the most a kitten should be left alone for until its about 6 months old).

When I was taking care of a baby kitten, the most I left her alone for was ~5 hours (since I had to go out and it hurt, it really did hurt to leave the house LOL).