If you wanna beat-mix (continously), then you will need CD-players with pitch and some sort of beat-counter. If you don't have equipment like that, then I would recommend the good old play and fade, where you fade out each song before crossfading to the next.
A little tip regarding lots of 80's stuff is that dance mixes by the same mixer/producer usually has the same bpm. Like any mixes produced by Stock/Aitken/Waterman runs within 1-2 bpm of each other. Makes them easy to beat-mix into each other.
I'm sure Daffy has more pointers for you.
