Okidoke, well if you're going Android to Android then it's dead simple. You just need to set up Wi-Fi Hotspot on the phone, give it a name and a password. Your tablet will then "see" that hotspot as a Wi-Fi network, and connecting to it is just as simple as connecting to your home router.
Once set up, most of it then becomes automatic: just switch hotspot on, your phone will automatically generate the hotspot, your tablet will automatically connect to that hotspot, and you can surf on your tablet using your phone's connection. It's such an elegant solution, it is exactly how I have mine set up and it works like a treat.