How to Find My Computer's Ip Address? [Duplicate]

I'm a total noob about TCP/IP, now reading some document (Sams Teach Yourself TCP/IP in 24 hours). However, I still don't get some concepts.

First of all, when I type "what's my ip address" in Google, it shows an address starting with 88.225 something, cool, but when I make this search from another computer in my home, it shows the exact same ip address. So it is probably the router's address for my ISP, right?

So how do I find my computer's (or network adapter's) ip address?

P.S. (a long one)

I need to know this because I want to setup a Unity Masterserver, in my old pc, which has ubuntu server installed. So any help about Ubuntu server - public(or static?) ip address setup is also much appreciated. But again, maybe everything will work if I know the public ip address of that machine.

That machine shows an ip like 192.168.1.36, and I can connect to it from my computer (connected to the same router) but of course not from another location. So I need to know it's "real(?)" ip address.

Thanks !

P.S. 2:

Neither ipconfig in windows' cmd, nor ifconfig in Ubuntu Server terminal gives useful information. They just print IP's that start with 255.255, and 192.168..