Job looking after a disabled 15 year old Boy.

I've been offered a Job. I have to look after a young 15 yearold disabled boy. He is in a wheelchair so he cannot get up and walk.

I have never gone in this industry before, and I'm so nervous! I have to entertain him so he is not looking at a screen all afternoon, I have to help him go toilet and shower him, I'm mature an old enough to do that, he is helpless and needs help. But I've never done it before and it does worry me.

I'm new to all of this does anyone work in this industry and have tips for the shower and toilet. And ways I can entertain him? And do fun things with him?