Zelda games don't usually require you to play them in any particular order, Majora's Mask is very unusual in that it does directly follow Ocarina of Time but only somewhat coincidentally. You'll understand the story just fine, there's only one small nuance that you might miss out on that serves as Link's initial motivation (read: excuse) for being where he is at the beginning of the game, but that gets quickly steamrolled by the plot about two minutes in and is largely ignored for the rest of the game. I can't remember if the opening text properly alludes to it, but you'll probably figure it out. It could still be entirely worth it to play Ocarina of Time first though, if only to gain a better appreciation for how Majora's Mask is different. I just found the pacing to be a tad slow and clunky after the fact.