How to only allow internet access.

I've got an ASA with two "outside" interfaces and twelve "inside" interfaces.
I'd like to separate the Access Lists between outside access and inside access. By default I'd like the inside interfaces access to the internet and nothing else and then build the ACL's to allow access between inside interfaces.
I can't imagine this being very difficult to achieve but I've spent quite sometime trying to accomplish this but haven't been able to make it work how I would like.
Does anyone have any tips?
Thanks,
Carlos

Carlos,
How I normally handle this is to build a network object group and place the RFC 1918 networks (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) in it and then do a deny to these networks with an allow IP any/any to the outside (internet).
HTH

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