I too found the first nine months or so really hard. I didn't know what to do with DS really.
We have a TinyLove gym that he really liked apart from the vibrating elephant that terrified him. Also I found Manhattan Toys mobile (all black, white and red) that he liked to lie under in his cot for at least twenty minutes. That was a total blessing because I could have a shower!
I used to sing Head, Shoulders, Knees and Toes to him a lot with exxagerate dance movements. I used to hold him and dance around the room al ot to Earth Wind and Fire and Black Eyed Peas. He still jiggles about when he hears that music now. Poor kid. He's not going to be cool, is he thanks to me!
Also, reading baby board books to him was good because they were short stories and he could grab at them or at first just stare at all the pictures. I read at least three of those to him every day. We still read now but he tears up a lot of books.
I found having friends with babies the most useful way to spend our time. I was lucky with a great NCT group and five of my other friends got pg at the same time so we were always visiting someone with a baby!
From six months, we started trying out different classes like Monkey Music, Tumble Tots, Sing and Sign. The only one we really liked and still go to at 18 months is Sing and Sign.
Also from six months, I took him to soft play centres. They usually have small baby areas and he loved the baby ball pools and all the soft shapes they have there. Plus other kids have always fascinated him.
I think chat is the most important thing you. As well as cuddles and lots of love. But telling your baby what you're doing like brushing your hair, weighing bananas at the supermarket, wiping his bottom etc is all very interesting to him/her.
Your baby just wants to be with and near to you, I reckon. Don't get the guilts about not being super active and animated all the time. You need to rest too! Stuff the housework!