Reply to Noobie question - When to start playing second song

So I just got a mixer today, and the thing I've been having trouble with is starting the second song at the right spot. I am using Virtual DJ and I know when I want the beat drop to happen, I know when I want to mix in the second song, but I don't know when to start it to get it to drop at the right part. Is there a way I can tell when I need to start a song? Is there a way that virtual DJ displays 8 bar phrases? That would be extremely helpful. For example say I want to put the beat drop on the second song that is loaded (and not playing), but sometimes I start the second song 4 counts too early, so when the first song (the one that is playing) is building up the second song has already dropped.