Answer: 11 people.
For this question, ignore all numbers that are not 0 to start with, as 0 is the only number that shows you an individual who is left-handed. Now, take a look at where 0 is. How many numbers do you see before it? There are 10 numbers before 0, and if you add 1 more, there are 11 in total. The first left-handed person is the 11th person Nathan will meet.