Review my startup idea

I am currently working on building my first startup called Chestbumpp. So basically chestbumpp will be a website where people can create and join sports groups to organize pick up games in your area for any sport. You'll be able to search for groups in your area and join them or simply create your own. It will be free to join. People can use it to organize practices for teams in formal leagues or they can use it to setup friendly pickup games at their local park or gym.

Here is the landing page: http://chestbumpp.com

It isn't much at the moment because a friend and I are in the process of developing it. You can check out what we plan on building from our very early mock up designs here:

https://photos-2.dropbox.com/t/0/AAByjh7JA76Qw_iUpbu3YlvMNepMAg4sbYagaoEKLy5KpA/12/1293866/png/32x32/3/_/1/2/chestbumpp.png/Jq96odgdBmcYKSZ9588OAsGRsG1TjSjfceoRrSiilDA?size=1280x960

https://photos-6.dropbox.com/t/0/AABVZ6X0zmorfD4h7NN68uAswydMiGj9Zi-zUWDQy3w-qQ/12/1293866/png/32x32/3/_/1/2/connectandplayContinued.png/3yRIvJgpBYVrplfE78xr2bvS9ZMggUendlAt8XNlBTg?size=1280x960

Let me know what you think. I'd appreciate your feedback.