Need help in wiring boombox!!!!

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I am making a boombox with this 2.1 60w amplifier which uses 12v x 2 more than 30w transformer i am planing to use 12vX3amp this transformer. I am using 3 stpd switches 1 for master on off , 1 for mains/battery selector, and one for aux /Bluetooth selector. 1 voltmeter two 12v batteries one dc input for battery charging and on mains input. Bluetooth i will be connecting with buck step down convertor. How should i do the wiring to the circuit. I really need help for this project. How much i connect the batteries? and the transformer is 12v 3 amp so which battery should i select and how should i connect spdt switch with mains and battery selector?

I am using this guide for instructables: 2.0 Portable Bluetooth Boombox - All

Any kind of help will be appreciated.

Thanks in advance!!

This is the circuit dig.
An externally hosted image should be here but it was not working when we last tested it.
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That Instructable lays things out pretty well. The transformer you link to is not the power supply adapter that is specified in the Instructable. If you wire that transformer to a battery, you'll start burning stuff up. Don't do it.

Read the Instructable carefully and follow those directions. It's all there.
Well, if you are switching between two +/- voltage sources, you will need a DPDT switch. And yes, you'll need an inverter to get your battery to provide a negative rail. But then you'll need a rectifier and regulator to charge the battery! If you're needing to use a +/- power supply, you'd better find a different Instructable. Otherwise, get a simple +12v amplifier.

When I'm wiring stuff up, I need to stand there, stare at the wires, think really hard about electrons, and then it'll make sense. So I can't help you with that from here.

Good luck!
So I am building something similar. However, I am dropping the dc step down and Bluetooth for a marine radio head unit(because it has Bluetooth built in), and probably no LED. I am using a panel that has a voltmeter, socket, dual USB ports and on/off switch. Can I use just the panel switch on the panel as a way to separate it running off battery or to an outlet(by way of c13 port and cord)?
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