The time had come for him to do some looking of his own- and he knew where to start.

But I wouldn't know where to start looking for him.

Perhaps you'd like to do more but don't know where to start?

We did not even know where to start with him.

For some, the problems are so large they do not know where to start.

He didn't even know where to start looking for them.

I wouldn't even know where to start looking for her.

We need something to go on to know where to start looking.

I'm not sure the present lot know where to start.

She has an idea but doesn't know where to start.