I'm a telecanvaser and make small talk in the office and on the phone ALL day, most days.

It's really not difficult, I just say what I'm thinking.

E.G
I walk into the room and see its 12:55. "FUCK, its 12:55 already? What's up with that, times gone well quick!" and then others will agree or whatever.

Small talk is mostly about opinions, whether you think that girl is fit or fat, and sociable bitching. Not in a bad way, but just talking about people (e.g work colleges, friends, your mum).

Things you watched on the telly last night, what you're going to do at the weekend and simple things.

I don't think about talking, I just talk. I say whatever I'm thinking.

Remember you don't always have to initialize the conversation, you can reply to what others are saying and chat in other peoples already going conversations.

The things you like and think about can be conversation starters if you're making small talk with a person that maybe slightly interested in them things.

Above all, don't think about it to much, just talk and soon you will be rolling and have much more sociable confidence.