Use the schematic from page 10 of the data sheet for your circuit. Just label the pin numbers with the pin description from page 2 of the data sheet.
I will admit the schematic is a bit much for someone who is new to electronics but at the same time this chip is a bit much for someone who is new to electronics. Your best bet would be to start with some smaller, cheaper amplifiers to learn how they work before moving on to something this complex. A good place to start would be the LM386.
If you are still insistant on using the TDA7294, then pay close attention because this is important; In the schematic the supply lines labled +40V and -40V are the main power supply and this is what will power the IC. The supply lines labled +20V and -20V are the stand by power lines, when the IC is put into standby mode it gets it's power from these lines. These could be any value that you want as long as the standby power is lower than the supply power.
You will need to add a heat sink to this IC because it will get hot no matter what voltage you use to supply it. You don't need to worry about frying the IC with over voltage as long as you stay away from it's maximum supply voltage of +50V -50V.
On the note of your fan, you don't need a resistor to protect the fan (I'm assuming this is why you added the resistor in the first place). As long as you supply the fan with 12V, it doesn't matter what current you supply it with the fan will only draw the current that it needs. If you are trying to protect your power supply using this fan then chances are your power supply is not very well built. A good powe supply won't need any fans to cool it. A good example would be the power supply in your TV for instance. The only reason your computer has a power supply is because the enginers needed to get a lot of power out of a small space so the heat sinks are realatively small.
Before you attempt to build this amplifier then you should probably read up on some basics about electronics so that you don't destroy something expensive, start a fire or kill yourself.
https://en.wikipedia.org/wiki/Ohm's_law Read the sections about circuit analysis, temperature effects, and relation to heat condidtions as well as the introduction
https://en.wikipedia.org/wiki/Resistors Read this whole thing, it's all important
https://en.wikipedia.org/wiki/Capacitors Read the section about suppresion and coupling
https://en.wikipedia.org/wiki/Voltage Read this whole thing before you start playing with the AC mains
https://en.wikipedia.org/wiki/Electrical_current Ditto
https://en.wikipedia.org/wiki/Power_supply#AC.2FDC_supply Just skim through this one to get an idea of how they work and what types there are
https://en.wikipedia.org/wiki/Amplifiers Read through this one very carefully and take note of what it is talking about
There is a lot more to tell you but I don't have the time, so read those and see if you still want to try this. (I'm not being mean, I'm trying to help you stay alive)