I did, it tells you nothing about connecting outside the network.
And what happens if the IP you are connecting to has more then one computer on it.
You handle this with the port mapping at your Airport Extreme. When it sees a request on port 5010, it redirects the request to port 5010 on the machine you specify with the private IP address, in your case you've used 10.0.1.201. You can check this in the System Prefs->Network->Airport->TCP/IP. Your computer's IP address is right there.
How do you know what computer your connecting too.
The port mapping tells the router which computer you want it to send requests for port 5010 to. That's the computer with your iSight attached.
How do I know what iSight on what computer I want to access?
If you have more than one computer with an iSight that you want to access, use a different port for each computer. The machines will have different IP addresses.
Let's say you have two machines, A and B, both with iSight cameras.
Machine A, lets say IP address is 10.0.1.3
Machine B, lets say IP address is 10.0.1.4
We'll use port 5010 for A and port 5012 for B. At the Airport Extreme, you would do something like the following...
Airport Port 5010 maps to 10.0.1.3 port 5010
Airport Port 5012 maps to 10.0.1.4 port 5012
On the iPhone Remote server running on Machine B, you would specify the server port (in Preferences) to be 5012.
And so you could have access to multiple machines on your home network.
So, from the iPhone, to access machine A you would go to URL
https://123.456.7.8:5010/ and for machine B you would go to URL
https://123.456.7.8:5012/