We started with our ducks back in August.
We went through Metzer Farms.
We got 1 Male Welsh Harlequin, 3 Female Welsh Harlequins and 1 surprise mix-up of a female Golden 300 Hybrid. (Metzer Farms kindly offered to refund the cost of her since it was supposed to be a 4th Welsh Harlequin but we were fine with having her)
I've enjoyed them immensely. If I could do it all over again, however, I think I'd approach it differently. Primarily I would have gotten probably stuck with 1 male and 1 female Welsh Harlequin, 1 Golden 300 Hybrid, 1 Cayuga and one other type of female. Just so we could enjoy the differences between them. Having 3 females of the same breed is fine and I love them but we're definitely going to add a female Cayuga into the mix in the spring/summer because they are absolutely beautiful.
Even though these are supposedly calm breeds they can be very loud which is not always suitable for urban homesteading. We live in a rural area but I'm sure our poor neighbors hear our ducks do their morning freak-out when they see me but so far they've said they don't mind at all.
So, in short, I'd go to the Metzer Farms website and study the breeds and then go from there.