I agree with patty. You need to use all your listening skills . Hopefully the SWs will know the children well and as she tells you about them, you will get hints as to what she thinks is important in a new family.
It's a bit like a job interview -you have to find out the keys knowledge, skills and experience they want and gear your Cv/presentation/interview to showing them how you meet these.
Some of these things might be very important , especially if she is an insightful and experienced worker. Others might be completely trivial , but you still need to go with them.
Eg I know a child who was placed with a family in the country because, they were told, she loved horse riding . Once the child was placed she went riding a few times and gave it up. She wasnt actually that keen at all, she only did it because foster carers did it and she went along with them.
And of course it's usual for children to take up new interests and drop others.
So I woudl hold off on the folder yet. It's good that you have done the research , if she says they love eg rainbows , you will know if there's a local group. And if you don't have children already, it will show that you are thinking about children's activities in your area.
The worker SHOULD be looking for much less concrete things, that will tell her what kind of family you are, in terms of lifestyle, energy levels, philosophy, values etc . And of course it's a two way process, although I accept it doesn't feel like it right now
Good luck !