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In a nutshell the current rating is irrelevant, the devices you have will draw their correct operating current at the nominated voltage, make the voltage higher and they may or may not draw more current dependant on the design of the device, there's really no single rule you can apply.
Many cheap 12 volt sources are unregulated, that can be a problem as the nominal 12 Volts is often around 18 and only drops when full load is used.
Provided yor Plugpack is regulated and around 12 Volts and DC you should have no problems, the current rating can be anything equal to, or greater than the current you need to run your devices.
Make 100% sure that the polarity of the connecting plug is correct, reversing the connection can have nasty consequences.
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