There are a few different ways to wire up your subs and amps. The most common way is to use what's called a daisy chain. This involves connecting the positive terminal of one amp to the negative terminal of another amp, then connecting the positive terminal of that second amp to the negative terminal of a third amp, and so on. You'll eventually connect the last amp in the chain to your subwoofer(s).
another way is to use an amplifier with multiple channels. If you have a 4-channel amplifier, you can wire each subwoofer to its own channel. This will give you more control over the sound because you can adjust the volume and EQ for each sub independently.
If you're using multiple amplifiers, it's important to match their impedance levels. For example, if you have two 4-ohm amplifiers, you should wire them in parallel so they operate as if they're one 8-ohm amplifier. Otherwise, one amplifier will be working harder than the other, which could damage your equipment or cause poor sound quality.