1. 2x 2gb
2. No, because the original SL DVD doesn't have a lot of drivers introduced with the new MBPs. You will need to install SL and 10.6.7 combo updater another way (connecting to another Mac is a good bet.)
not sure i understand...like set up another, older machine with the latest SL and then clone it onto the mbp?
2011 MBPs won't even boot with anything less than the special version of 10.6.6 that they came with. 10.6.7 is the first official release with the required drivers in it.
If it were me doing this, rather than some complicated clone whatever process, I would just buy an OS X 10.6.7+ disk.