Mixset

I want to mix songs, not just burn cd in order of songs I like. I want to mix two songs into one, for example:
Make this one song, then burn it onto CD:

Maxamillion - “Sexual Healing” with Shabba Ranks, “Slow and Sexy (with Johnny Gill)

Turntables, and controls

Hi!
I’ve been elected to be the DJ for my high-school’s all night grad party. I have bunch of songs i’d probably use (still need suggestions though), and garageband for mac. I was wondering in case there are guidelines I should follow while piecing long mix together. Any tips, or ideas that have helped you in the past.
Thanks