How to hook up 12'' alpine type to rockford fosgate 800a2 amp?

I'm trying to install my 4ohm version 12'' alpine type r with my rockford fosgate 800a2 amp. i was told that this was the 800watt version but i'm not sure if it might be the 1000a2 since the badge fell off. (pics below) and if it matters, the box is sealed.

-I want to know what would be the best way to hook it up and have the type r run at it's rms of 500watts.

-how much should my gain screws be turned up?

-if my crossover switch should be LP, FULL, or HP?

-what should my crossover frequency? be it goes from 80-210hz.

-how much should the bass punch knob be turned up?

I have been reading that since its a 4ohm dvc sub, it can only be hooked up as 4ohm or 1 ohm and that leaves me with 4ohm since this amp is not 1 ohm stable. is this true or can the sub be hooked up as 2ohm?

I am a noob so please excuse me if i'm not using the correct terms and such but after 2 blown subs, i am ready to wire this one up correctly! thanks in advance. and if you can please try to answser all my questions..

I was just gonna hook it up like how this crutchfield diagrams illustrates: