1993 Aerostar Question

Hello !
I have a 1993 aerostar and would like to remove the radio and replace it with a different one that has a cd player.
Currently I know that I will need the special radio remove tool and I seen
the screws behind the ash tray, but I can not find the others screws or the clips I need to loosen to remove the outer cover.
Can someone help me on this as I do on a book telling me some info, but dose not explain the rest beyond what I listed and the amp info.
Also is there any special in on installing a sony 810 Xplode hooking it up with the amp already in there on the wire hook up as I will also be running a sony xgl2200 amp pushing 2 10" sony subs with a 1/2 cap that I had in a festiva.
Also dose anyone have any info on the speakers on what they will handle as I have no clue if the amp mounted under the radio runs all the speaker or only a few.
Also the radio controls behind the driver seat next to the first row seat works only the speaker level dose not seem to be working and would that mean the speakers hooked upto it is not working or is there something else about it ?
Thanks in advance !!!

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