How do you go about becoming a surrogate mother or egg donor?

And how much do they generally get paid for it?How do you go about becoming a surrogate mother or egg donor?
Surrogates are often people you know - friends, sisters, aunts, etc. Hope you don't want to do this for the wrong reason (the money). You can end up emotionally scarred and scar someone else. Please don't mess around with this sort of thing.