The fisrt thing you should know about approaching craps is the probability of each outcome of the dice. There's a simple table for that.
Now looking at the come out roll, if you bet "Pass line," your odds of winning on the come out roll (7 or 11) are 8/36 (8 winning outcomes out of 36 possible outcomes). And your chances to lose on the come out roll (2, 3 or 12) are 4/36 (4 losing outcomes out of 36 possible). And your chances of establishing a point are 24/36.
If you choose to bet on the "Don't Pass," your odds of winning on the come out roll (2 or 3) are 3/36. Your odds of losing on the come out roll (7 or 11) are 8/36. You also have a 1/36 chance of pushing (12) on the come out roll (12 is the house's number, that's how they skew the odds in their favor). And that leaves a 24/36 of establishing a point.
Once a point is established (4,5,6,8,9,10), you need to hit that point without rolling a 7 if you bet "Pass Line." This puts the odds in favor with the house as the likelyhood of rolling a 7 is 6/36 which is greater than the odds of any other outcome on the dice.
However if you are betting "Don't Pass." Then the odds are in your favor with the point because you are betting on a 7 being rolled before the point is rolled again.
My advice is, bet "Don't pass" and hope for a point to be established (odds are in favor of that during the come out roll). And don't cheer too loudly because the other people at the table tend to get irritated when the "Don't pass" better is cheering.