Macross titles are
SDF Macross (TV)
Macross: Do You Remember Love (movie, retelling of the original)
Macross 2: Lovers Again (Non-canon OVA)
Macross 7 (TV)
Macross Plus (OVA)
Macross Zero (OVA, prequel to SDF Macross)
Macross Frontier (TV).
You can get away with watching basically any of them whenever you feel like it. If you want a primer, DYRL is a good place to start. If you want the full story, watch SDF Macross.
But you don't *really* need to know anything to watch Frontier. At best you'll miss the little references thrown in for long-time fans, the necessary background info is provided for you and the story stands well enough on its own.