Dus-Sn

I've always wondered: how does courtship work in the Amish community? Serious question. Are marriages arranged or are males and females free to court whomever they want? If the latter, what is there to do on "dates?"
Thanks

As a follow-up to this; are there males/females who have courted multiple people before finally settling down with one person or is it an unspoken rule where once you start dating someone thats the person you're destined to marry?