When I did my Safari, I used a fine toothed circular saw blade and if I remember right, I cut the boards with the finished side facing down to avoid chipping. No need to mask off with tape that I remember.
On the jig saw with the laminte blade you cut finish up because the blade takes that into account already. If I remember correctly.
You need to start on one side and work your way to the other with the floating floor. On the side your going against, you put spacers in at the wall to maintain that expansion joint. So you start against one side and work your way across. Be sure to stagger the boards. For example the first board may be full peice, next is 2/3, next is 1/3, then start a full peice again. This keeps the joints from lining up.
If you have the foam underlayment already attached you don't put any more on the floor. It's just to help keep the noise and creaking to a minimum.