Essentially, if you pick a devil fruit, you'll be able to learn to use new techniques  with this devil fruit as the roleplay progresses.

Those without a devil fruit will most likely get stronger Haki compared to those who have a devil fruit.

I'll put up the OOC tomorrow, or in my timezone's case, in about 11 hours, regardless if we have five people or not. You can post your devil fruits and abilities on the CS skeleton that I will provide there :P