My SW and panels loved that I'd spent time volunteering with school age kids, so had experience and empathy with the kid-who-can't-sit-still, or the kid-who-knows-no-boundaries, or the kid-no-one-likes.
Family experience is great, but possibly likely to be children that have be parented in a familial way that is familiar, whereas volunteering shows you can care for children outside your familial circle. To SWs. Think of it like a uni application- we both know you can do it, but ticking certain boxes helps prove you have those competencies.
SWs love ticky boxes. It's like a job interview, and it's reasonably easy to get the job spec.
Also spend this time reading as much as you can. I did, and I certainly went through wobbles of thinking it was too hard.
And it is hard. But LO is a bundle of fun and gorgeousness, too, and we're so happy. 
My time frame was slightly longer, because I waited for a course. I went on a course in January, and was matched a year later. It goes sloooooowly, then fast fast fast!