I will also suggest the FB group. It really does have all you ever wanted to know about OBW.
https://www.facebook.com/groups/OBWQuiltForum/
Fabric choice is main thing in a OBW.
If you can get your hands on Maxine Rosenthal's book One Block Wonders it will help a lot. I got the kindle version and read it on my tablet and pc.
Here is a link to the design helper where you can insert a picture of your fabric and see how it will look as a OBW. Wish I had known about it before making mine. My fabric choice was not the best for a OBW and the finished quilt didn't look all that much different from the basic fabric. I finished it as a learning tool and it turned out ok but not spectacular like some.
http://oneblockwonder.com/design-helper/
Have fun!!