Donating a kidney please help?

Wow Shannon, that's a huge step to consider! I commend you for wanting to do it. Rather than asking such an important question at this generalized site, may I suggest that you go to the National Kidney Foundation website? It's www.kidney.org. There you will find much more expert information and many people who have been in the same or similar situations to you. You should get a lot more and better responses there. Best of luck to you and your brother!