Best wishes to you. That's very kind of you thinking about the kidney donation.
Also, with being healthy, you'd have to be match for that individual. I just did a search and found something about tests you'd need beforehand:
Kidney Transplant manual | Tests you need before surgery
I haven't donated a kidney, but have seen how such a toll having to go through kidney dialysis is for a close friend and family members of other friends.
I've been very interested in a project called "The Kidney Project" which is pretty much an implantable artificial kidney that is about the size of a coffee cup and isn't hooked up to an external power source (like a dialysis machine) but instead run by the person's blood pressure. Not only such a possible life saving thing, but the technology is quite interesting too. This would perform the majority functions of a regular kidney whereas dialysis only performs about 10%.
If there's enough funding, I read that human trials are scheduled for 2017. Otherwise, the human trials will be delayed. Imagine a time where folks on the wait list don't have to wait (sadly, many die waiting) and don't have to suffer the toll dialysis takes.
If interested, you can read more about the project here: