Amp question

[Dawgggk]

I am fairly new to car audio, so this doesn't always make sense:

I have 2 Rockford Fosgate shallow r2s I'm about to order. I already have the box.

My main confusion is the OHMs, and what wattage amp I would need.

I can either grab two 2ohm subs or two 4ohm subs, what is the difference? Which would be better?

What wattage amp would I need for the two 2 ohms, or the two 4 ohms? Mono block would work for two subs, correct?

Someone please explain to me what I need, and why I need it. Thanks.

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