Use CPU-Z (google search) and it will tell you your chipset.
OR, Do a google search for your exact laptop model and chipset.
Then you can check the intel site (or do another google search) for your chipset and dual/single channel.
THis will give you all the information you need.
As for where to put the memory, does not really matter.
Some may say to put the biggest in the primary slot (I am not sure where the memory slots are located on your board, but I am thinking the...