a lot is equipment specific, and can only really get accurate with experience on that equipment. 1) 15% is a fair number to start with, can vary by equipment and whether you do a nice rolling boil, or have the burner in blast furnace mode. I get about 20% with my keggle, around 29% when I use the wading pool (82qt SS stockpot)
2)depends on how picky you are, I always use hop bags so I don't get a whole lot of hop mess in the bottom of the pot, I use whirfloc, so I do get a lot of break material after everything is cooled down. I try to transfer as little of the break material as I can, so I usually lose close to 1/2 a gallon here. I use a regular copper wort chiller here, so no loss due to cooling.
3) I think the default 4% works pretty well all around
4) whatever you can get! 75 is a good baseline don't sweat it if it's lower, smile if it's higher. batch sparging my worst was 65% best was 88%.
5) looks good, I like it a little thinner, I go 1.5 per pound (seems) to have helped with my efficiency a bit.
6) doesn't sound right, the grain will soak up quite a bit on the first run.
in beersmith mash section hit choose, and look for single infusion batch sparge
light/ medium body, whatever you want. pick it, go back to main screen and hit mash detail, here you can click double batch sparge, equal batches. go back to the main screen, hit preview brewsheet up at the top, should give you all the info you need there.
7) that probably is low depends on what you're going into. I use a 10 gallon igloo cooler that I don't preheat other than leaving it in the house overnight, and 22 degrees over strike temp hits spot on everytime. beersmiths number works for me if I mash in the wading pool, first time around it's not a bad idea to have a gallon or so of boiling water and a gallon of cold water handy, if you have to adjust just subtract the amount you use from your total volume.