If it were 8.8/14.08 Then you would first move over one place from the 12.8. (Basically you would then have 88/140.8)
Now, you divide, 88 goes into 140 once, and your left with 52, bring down the 8, and 528. 88 goes into 528 six times evenly. Your left with 18, but the 140.8 has a decimal place one to the left, so you put your decimal place one to the left in your answer: 1.8
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Yes
line up the decimals together
You need to line up decimals for additional and subtraction. For multiplication, you don't need to line them up - in fact, it would serve no useful purpose.
Yes. Line up them up when you're adding, too.
39.63 +42.35 ------------ 81.98 Just line up the decimals and then add.